.nomedia + SD Card - just can't create the file, no matter what

I have an ASUS Zenfone 7 Pro phone running Android 11. This phone comes with an SD card slot and so I wanted to make use of it. It stored the files great, I can read the files all good. But I cannot make my Gallery/Android System ignore any folder on the MicroSD card. For example, I have a folder with album previews. These all show up as folders in Gallery - needlessly. So why I can't make the file? I don't know. If I open Solid Explorer and try to create a new empty file as .nomedia anywhere on the SD card, it will just time out and will fail at the task. I can only force close the app when this happens. Other apps just gave me an error, but nothing specific. How do I overcome this limitation? Maybe it's because the SD card is formatted FAT32? But I remember using MicroSD in my old Note 4 and other phones, and they handled .nomedia just fine. What changed? Something Android 11 related?