I can’t upload some file which have different extensions.

[diyarkaya489]

Using multipleFileUploadEditor for doc uploading but when ı try .elt or .STEP drawing its not working. It shows notify error and can't upload .elt file. I tried allowextension, allownonimage property but didn't work.

[edwardch]

Can you check/share that section of your app settings?

Mine looks like this and works for custom extensions:

 "UploadSettings": {
    "Path": "~/App_Data/upload/",
    "ExtensionWhitelist": ".txt;.csv;.pgp;.xlsx"
  },

ie. Include the . prefix and the ; separator

[diyarkaya489]

Thanks :) Solved