Could you precise what you mean when saying "None of the files I drop into the PSX rom folder will take" ?
- Does that mean you don't see them popping up in emulationstation after a restart or a gamelist update?
- You see them in emulationstation but you don't succeed to launch them? (like black screen then move back to emulationstation menu)
It would be good also to know the version of recalbox you're running because I know that in 4.1 they automatically remove the .bin file from appearing in the emulationstation menu in order to not have duplicate displayed games.
You shouldn't convert any .bin file into eboot. I mean Eboot file is nice if you want to have one file for several CDroms (like the final fantasy games or some others. For the other games with only 1 cdrom, I would recommend to keep bin/cue/iso format.