diff --git a/__init__.py b/__init__.py
index ff4612e..0484eab 100644
--- a/__init__.py
+++ b/__init__.py
@@ -114,7 +114,8 @@ async def create_model(request):
     - downloadUrl: download url.
     - hash: a JSON string containing the hash value of the downloaded model.
     """
-    task_data = await request.json()
+    task_data = await request.post()
+    task_data = dict(task_data)
     try:
         task_id = await services.create_model_download_task(task_data, request)
         return web.json_response({"success": True, "data": {"taskId": task_id}})
@@ -186,7 +187,8 @@ async def update_model(request):
     index = int(request.match_info.get("index", None))
     filename = request.match_info.get("filename", None)
 
-    model_data: dict = await request.json()
+    model_data = await request.post()
+    model_data = dict(model_data)
 
     try:
         model_path = utils.get_valid_full_path(model_type, index, filename)
diff --git a/py/download.py b/py/download.py
index 84f61d2..49c3ec6 100644
--- a/py/download.py
+++ b/py/download.py
@@ -180,8 +180,8 @@ async def create_model_download_task(task_data: dict, request):
         raise RuntimeError(f"Task {task_id} already exists")
 
     try:
-        preview_url = task_data.pop("preview", None)
-        utils.save_model_preview_image(task_path, preview_url)
+        previewFile = task_data.pop("previewFile", None)
+        utils.save_model_preview_image(task_path, previewFile)
         set_task_content(task_id, task_data)
         task_status = TaskStatus(
             taskId=task_id,
@@ -361,9 +361,7 @@ async def download_model_file(
     )
 
     if response.status_code not in (200, 206):
-        raise RuntimeError(
-            f"Failed to download {task_content.fullname}, status code: {response.status_code}"
-        )
+        raise RuntimeError(f"Failed to download {task_content.fullname}, status code: {response.status_code}")
 
     # Some models require logging in before they can be downloaded.
     # If no token is carried, it will be redirected to the login page.
@@ -376,9 +374,7 @@ async def download_model_file(
         # If it cannot be downloaded, a redirect will definitely occur.
         # Maybe consider getting the redirect url from response.history to make a judgment.
         # Here we also need to consider how different websites are processed.
-        raise RuntimeError(
-            f"{task_content.fullname} needs to be logged in to download. Please set the API-Key first."
-        )
+        raise RuntimeError(f"{task_content.fullname} needs to be logged in to download. Please set the API-Key first.")
 
     # When parsing model information from HuggingFace API,
     # the file size was not found and needs to be obtained from the response header.
diff --git a/py/services.py b/py/services.py
index b623bc4..3768aaa 100644
--- a/py/services.py
+++ b/py/services.py
@@ -73,7 +73,10 @@ def update_model(model_path: str, model_data: dict):
 
     if "previewFile" in model_data:
         previewFile = model_data["previewFile"]
-        utils.save_model_preview_image(model_path, previewFile)
+        if type(previewFile) is str and previewFile == "undefined":
+            utils.remove_model_preview_image(model_path)
+        else:
+            utils.save_model_preview_image(model_path, previewFile)
 
     if "description" in model_data:
         description = model_data["description"]
diff --git a/py/utils.py b/py/utils.py
index 275e636..3a5163a 100644
--- a/py/utils.py
+++ b/py/utils.py
@@ -249,19 +249,45 @@ from PIL import Image
 from io import BytesIO
 
 
-def save_model_preview_image(model_path: str, image_url: str):
-    try:
-        image_response = requests.get(image_url)
-        image_response.raise_for_status()
+def remove_model_preview_image(model_path: str):
+    basename = os.path.splitext(model_path)[0]
+    preview_path = f"{basename}.webp"
+    if os.path.exists(preview_path):
+        os.remove(preview_path)
 
-        basename = os.path.splitext(model_path)[0]
-        preview_path = f"{basename}.webp"
-        image = Image.open(BytesIO(image_response.content))
+
+def save_model_preview_image(model_path: str, image_file_or_url: Any):
+    basename = os.path.splitext(model_path)[0]
+    preview_path = f"{basename}.webp"
+
+    # Download image file if it is url
+    if type(image_file_or_url) is str:
+        image_url = image_file_or_url
+
+        try:
+            image_response = requests.get(image_url)
+            image_response.raise_for_status()
+
+            image = Image.open(BytesIO(image_response.content))
+            image.save(preview_path, "WEBP")
+
+        except Exception as e:
+            print_error(f"Failed to download image: {e}")
+
+    else:
+        # Assert image as file
+        image_file = image_file_or_url
+
+        if not isinstance(image_file, web.FileField):
+            raise RuntimeError("Invalid image file")
+
+        content_type: str = image_file.content_type
+        if not content_type.startswith("image/"):
+            raise RuntimeError(f"FileTypeError: expected image, got {content_type}")
+
+        image = Image.open(image_file.file)
         image.save(preview_path, "WEBP")
 
-    except Exception as e:
-        print_error(f"Failed to download image: {e}")
-
 
 def get_model_all_descriptions(model_path: str):
     base_dirname = os.path.dirname(model_path)
diff --git a/src/components/DialogCreateTask.vue b/src/components/DialogCreateTask.vue
index 0c1d09d..2ba5e04 100644
--- a/src/components/DialogCreateTask.vue
+++ b/src/components/DialogCreateTask.vue
@@ -69,7 +69,8 @@ import { useLoading } from 'hooks/loading'
 import { request } from 'hooks/request'
 import { useToast } from 'hooks/toast'
 import Button from 'primevue/button'
-import { VersionModel } from 'types/typings'
+import { VersionModel, WithResolved } from 'types/typings'
+import { previewUrlToFile } from 'utils/common'
 import { ref } from 'vue'
 
 const { isMobile } = useConfig()
@@ -87,12 +88,49 @@ const searchModelsByUrl = async () => {
   }
 }
 
-const createDownTask = async (data: VersionModel) => {
+const createDownTask = async (data: WithResolved<VersionModel>) => {
   loading.show()
 
+  const formData = new FormData()
+  for (const key in data) {
+    if (Object.prototype.hasOwnProperty.call(data, key)) {
+      let value = data[key]
+
+      // set preview file
+      if (key === 'preview') {
+        if (value) {
+          const previewFile = await previewUrlToFile(value).catch(() => {
+            loading.hide()
+            toast.add({
+              severity: 'error',
+              summary: 'Error',
+              detail: 'Failed to download preview',
+              life: 5000,
+            })
+            throw new Error('Failed to download preview')
+          })
+          formData.append('previewFile', previewFile)
+        } else {
+          formData.append('previewFile', value)
+        }
+        continue
+      }
+
+      if (typeof value === 'object') {
+        value = JSON.stringify(value)
+      }
+
+      if (typeof value === 'number') {
+        value = value.toString()
+      }
+
+      formData.append(key, value)
+    }
+  }
+
   await request('/model', {
     method: 'POST',
-    body: JSON.stringify(data),
+    body: formData,
   })
     .then(() => {
       dialog.close()
diff --git a/src/components/DialogModelDetail.vue b/src/components/DialogModelDetail.vue
index 38c2c5a..d51cf38 100644
--- a/src/components/DialogModelDetail.vue
+++ b/src/components/DialogModelDetail.vue
@@ -47,7 +47,7 @@ import ResponseScroll from 'components/ResponseScroll.vue'
 import { useModelNodeAction, useModels } from 'hooks/model'
 import { useRequest } from 'hooks/request'
 import Button from 'primevue/button'
-import { BaseModel, Model } from 'types/typings'
+import { BaseModel, Model, WithResolved } from 'types/typings'
 import { computed, ref } from 'vue'
 
 interface Props {
@@ -72,7 +72,7 @@ const handleCancel = () => {
   editable.value = false
 }
 
-const handleSave = async (data: BaseModel) => {
+const handleSave = async (data: WithResolved<BaseModel>) => {
   await update(modelContent.value, data)
   editable.value = false
 }
diff --git a/src/components/ModelContent.vue b/src/components/ModelContent.vue
index 77f6155..6c1dd49 100644
--- a/src/components/ModelContent.vue
+++ b/src/components/ModelContent.vue
@@ -62,7 +62,7 @@ import TabList from 'primevue/tablist'
 import TabPanel from 'primevue/tabpanel'
 import TabPanels from 'primevue/tabpanels'
 import Tabs from 'primevue/tabs'
-import { BaseModel } from 'types/typings'
+import { BaseModel, WithResolved } from 'types/typings'
 import { toRaw, watch } from 'vue'
 
 interface Props {
@@ -73,7 +73,7 @@ const props = defineProps<Props>()
 const editable = defineModel<boolean>('editable')
 
 const emits = defineEmits<{
-  submit: [formData: BaseModel]
+  submit: [formData: WithResolved<BaseModel>]
   reset: []
 }>()
 
diff --git a/src/hooks/model.ts b/src/hooks/model.ts
index e65ac13..fa5199c 100644
--- a/src/hooks/model.ts
+++ b/src/hooks/model.ts
@@ -3,10 +3,10 @@ import { useMarkdown } from 'hooks/markdown'
 import { request } from 'hooks/request'
 import { defineStore } from 'hooks/store'
 import { useToast } from 'hooks/toast'
-import { cloneDeep } from 'lodash'
+import { castArray, cloneDeep } from 'lodash'
 import { app } from 'scripts/comfyAPI'
-import { BaseModel, Model, SelectEvent } from 'types/typings'
-import { bytesToSize, formatDate } from 'utils/common'
+import { BaseModel, Model, SelectEvent, WithResolved } from 'types/typings'
+import { bytesToSize, formatDate, previewUrlToFile } from 'utils/common'
 import { ModelGrid } from 'utils/legacy'
 import { genModelKey, resolveModelTypeLoader } from 'utils/model'
 import {
@@ -74,18 +74,30 @@ export const useModels = defineStore('models', (store) => {
     )
   }
 
-  const updateModel = async (model: BaseModel, data: BaseModel) => {
-    const updateData = new Map()
+  const updateModel = async (
+    model: BaseModel,
+    data: WithResolved<BaseModel>,
+  ) => {
+    const updateData = new FormData()
     let oldKey: string | null = null
+    let needUpdate = false
 
     // Check current preview
     if (model.preview !== data.preview) {
-      updateData.set('previewFile', data.preview)
+      const preview = data.preview
+      if (preview) {
+        const previewFile = await previewUrlToFile(data.preview as string)
+        updateData.set('previewFile', previewFile)
+      } else {
+        updateData.set('previewFile', 'undefined')
+      }
+      needUpdate = true
     }
 
     // Check current description
     if (model.description !== data.description) {
       updateData.set('description', data.description)
+      needUpdate = true
     }
 
     // Check current name and pathIndex
@@ -97,16 +109,17 @@ export const useModels = defineStore('models', (store) => {
       updateData.set('type', data.type)
       updateData.set('pathIndex', data.pathIndex.toString())
       updateData.set('fullname', data.fullname)
+      needUpdate = true
     }
 
-    if (updateData.size === 0) {
+    if (!needUpdate) {
       return
     }
 
     loading.show()
     await request(`/model/${model.type}/${model.pathIndex}/${model.fullname}`, {
       method: 'PUT',
-      body: JSON.stringify(Object.fromEntries(updateData.entries())),
+      body: updateData,
     })
       .catch((err) => {
         const error_message = err.message ?? err.error
@@ -216,15 +229,15 @@ export const useModelFormData = (getFormData: () => BaseModel) => {
     }
   }
 
-  type SubmitCallback = (data: BaseModel) => void
+  type SubmitCallback = (data: WithResolved<BaseModel>) => void
   const submitCallback = ref<SubmitCallback[]>([])
 
   const registerSubmit = (callback: SubmitCallback) => {
     submitCallback.value.push(callback)
   }
 
-  const submit = () => {
-    const data = cloneDeep(toRaw(unref(formData)))
+  const submit = (): WithResolved<BaseModel> => {
+    const data: any = cloneDeep(toRaw(unref(formData)))
     for (const callback of submitCallback.value) {
       callback(data)
     }
@@ -394,9 +407,7 @@ export const useModelPreviewEditor = (formInstance: ModelFormInstance) => {
    * Default images
    */
   const defaultContent = computed(() => {
-    return Array.isArray(model.value.preview)
-      ? model.value.preview
-      : [model.value.preview]
+    return model.value.preview ? castArray(model.value.preview) : []
   })
   const defaultContentPage = ref(0)
 
@@ -435,7 +446,7 @@ export const useModelPreviewEditor = (formInstance: ModelFormInstance) => {
         content = localContent.value
         break
       default:
-        content = noPreviewContent.value
+        content = undefined
         break
     }
 
@@ -451,7 +462,7 @@ export const useModelPreviewEditor = (formInstance: ModelFormInstance) => {
     })
 
     registerSubmit((data) => {
-      data.preview = preview.value ?? noPreviewContent.value
+      data.preview = preview.value
     })
   })
 
diff --git a/src/types/typings.d.ts b/src/types/typings.d.ts
index 3c81ec3..9312331 100644
--- a/src/types/typings.d.ts
+++ b/src/types/typings.d.ts
@@ -26,6 +26,10 @@ export interface VersionModel extends BaseModel {
   hashes?: Record<string, string>
 }
 
+export type WithResolved<T> = Omit<T, 'preview'> & {
+  preview: string | undefined
+}
+
 export type PassThrough<T = void> = T | object | undefined
 
 export interface SelectOptions {
diff --git a/src/utils/common.ts b/src/utils/common.ts
index fd1c0f7..5d6a259 100644
--- a/src/utils/common.ts
+++ b/src/utils/common.ts
@@ -26,3 +26,14 @@ export const bytesToSize = (
 export const formatDate = (date: number | string | Date) => {
   return dayjs(date).format('YYYY-MM-DD HH:mm:ss')
 }
+
+export const previewUrlToFile = async (url: string) => {
+  return fetch(url)
+    .then((res) => res.blob())
+    .then((blob) => {
+      const type = blob.type
+      const extension = type.split('/')[1]
+      const file = new File([blob], `preview.${extension}`, { type })
+      return file
+    })
+}