Gutenberg: m4a files not uploading to posts

[detlefholtz]

Describe the bug
When editing a post, m4a files cannot be added directly from desktop through the block. It seems to work when going through the Media Library it works, but when uploading through the block I receive the error Sorry, this file type is not permitted for security reasons.

To Reproduce
Steps to reproduce the behavior:

1. Create a new post.
2. Try adding an m4a file from desktop to a block using the audio option.
3. See error

Expected behavior
File should've uploaded straight to post. Works well when choosing an m4a that's already been uploaded to the Media Library.

Desktop (please complete the following information):

• OS: OS X 10.13.4
  
  
  
  • Browser: Chrome Version 68
  
  
  • Gutenburg Version 3.5.0
  
  

[designsimply]

Thanks for reporting this! First, for reference, I checked to see if .m4a files are a supported file type and they are. Next, I tested and confirmed that dragging an .m4a file into the editor results in a file block with an error message that says:

Sorry, this file type is not permitted for security reasons.

I also tested dragging an .m4a file into an audio block and got the same error. (52s)

^{Seen at http://alittletestblog.com/wp-admin/post.php?post=14327&action=edit running WordPress 4.9.8 and Gutenberg 3.5.0 using Firefox 61.0.2 on macOS 10.13.6.}

Sample file: https://github.com/robovm/apple-ios-samples/blob/master/avTouch/sample.m4a

[Soean]

When I upload a MP4 file, it has the mime type audio/x-m4a. This one is not supported in wp_get_mime_types(). Trac ticket 40175 will fix this issue: https://core.trac.wordpress.org/ticket/40175

[jorgefilipecosta]

Thank you @detlefholtz for reporting this issue. Thank you @designsimply and @Soean for your insights. It seems this issue contains good progress on trac so I will close this issue as we can track it on https://core.trac.wordpress.org/ticket/40175.