Uploads are almost always 4.1K

On Mac OS using latest Local by Flywheel all uploads in WordPress appear to be 4.1K large. Every time. When it’s a video, it can’t be played.

Here a directory listing as an example:

/Users/michael-heuberger/Local Sites/(my test site)/app/public/wp-content/uploads/2018/07 
$ la                                                                                                                                                                           
-rw-r--r--  1 michael-heuberger  staff   4.1K 16 Jul 18:23 148863337136.webm
-rw-r--r--  1 michael-heuberger  staff   4.1K 16 Jul 18:20 279892931352.webm
-rw-r--r--  1 michael-heuberger  staff   4.1K 16 Jul 18:22 330014371325.webm
-rw-r--r--  1 michael-heuberger  staff    39K 16 Jul 18:25 145163372442.webm <--- here a working one
-rw-r--r--  1 michael-heuberger  staff   4.1K 16 Jul 18:24 57609106783.webm

When you research you will see that symlinks are always 4.1K. But wait, you see one of the above video files has a reasonable size of 39K and can be played. All others are 4.1K

Probably a bug when it comes to Volumes mapping, Docker, Virtual Stuff or so? Not sure.

Any clues?

Thanks
Michael

Anyone?? Any clues?