maybe

"for some reason i can't find these in my files anymore" Sounds more like a problem on your side.

for some reason i can't find these in my files anymore. had them there for a while but i guess it just stopped working somehow.

Uhm, it's Steam that doesn't recognize maps (when it comes to upload them directly to the workshop).
SFM recognizes that maps just fine.

huh, weird, is there any way to convert maps to bsp? I've done some ammount of mapping before and usually i can only open the maps in sfm after converting to bsp through playing the map in portal, tf2 or half life.

Steam doesn't recognize "recompiled" maps after they've been "packed up" with the content of the map itself.

im sorry but, what is actually stopping you from uploading to steam workshop?

Did you even read the description...?

i cant find them in the maps list

these are perfect scenebuild maps