Thumbnails (!) Load, [!] Don't

I’m very new to RetroArch and Emulators/Roms - please forgive me. But RetroArch is the best I’ve used so far!

I searched the forum and online and couldn’t find this issue, so I thought I should post.

When I upate the boxart/thumbnails for N64 (only N64, others are fine), any of the roms with (!) at the end of the file name will load the boxart. Any of the roms that end with [!] won’t.

I went online and read that they both mean “Very Good Dump” if I’m correct. And I renamed the files with the working (!) and deleted the old playlist and reloaded it. The file names appear the same with the old [!] even though I changed it it to (!), and they still won’t update.

What am I missing? Thank you for any advice!