Get correct mimetype through entity_normalizer

src/components/post_status_form/post_status_form.js

@@ -292,7 +292,7 @@ const PostStatusForm = {
       this.submitDisabled = false
     },
     type (fileInfo) {
-      return fileTypeService.fileType(fileInfo.pleroma.mime_type)
+      return fileTypeService.fileType(fileInfo.mimetype)
     },
     paste (e) {
       if (e.clipboardData.files.length > 0) {

src/services/entity_normalizer/entity_normalizer.service.js

@@ -128,13 +128,12 @@ export const parseUser = (data) => {
   return output
 }
 
-const parseAttachment = (data) => {
+export const parseAttachment = (data) => {
   const output = {}
   const masto = !data.hasOwnProperty('oembed')
 
   if (masto) {
-    // Not exactly same...
-    output.mimetype = data.type
+    output.mimetype = data.pleroma.mime_type
     output.meta = data.meta // not present in BE yet
   } else {
     output.mimetype = data.mimetype