Jertzukka

It is very difficult to hide completely random data within other filetypes that are not random. This will pass the cursory glance, but any serious analysis will reveal that your corrupted file or video file contains completely random data. You don't even need to get into video format specifications to see what the stream end sequence looks like, just measuring entropy in the file is enough. Attached is an example of the entropy on a 360MB video file which actually is a 255MB video with a 105MB container...

Use --fs-options=iocharset=utf8

Yes exFAT works.

What filesystem is on your file container? If it is NTFS, the default driver for it on macOS doesn't support writing anymore, so you would need either something like Tuxera NTFS or Paragon NTFS installed. Also if you have problems with macFUSE, I would recommend you to try out the Nightly build which you can find here under Files -> Nightly builds -> macOS. It uses FUSE-T instead of macFUSE which people have reported to work better.

Please uninstall your currect version by running sudo veracrypt-uninstall.sh and then reinstall the gtk3 version, which should be "veracrypt-1.26.7-setup-gtk3-gui-x64". The one you have installed is the legacy gtk2 version which has been reported to have problems on newer systems.

Have you updated your system or macFUSE since the last time it worked? There has been a lot of problems with macFUSE on Sonoma, and the latest Nightly release is testing support for FUSE-T. If you want to try it out, you can find it here under Files, Nightly Builds and macOS. To get it working you'd uninstall macFUSE and install fuse-t from Brew instead.

If you're referring to the Volume Creation Wizard, which page are you having difficulty with?

Are you attempting to use "Auto-mount devices" to mount your file container, or are you referring to the Favorite volumes?