How to allow only certain file types?

How to allow only certain file types?

For example:

  1. User wants to add a file to a project.
  2. User click “Add File Button” = File Uploader
  3. User Select a File to be added.
  4. Condition = If File type is not one of the following ( pdf, png, mp4, mp3, pbix ) then delete file and reset and animate warning popup.

Checkout this plugin by @Thimo

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