Yes, I am aware how Fxx works in Amiga MODs, however there are some specific versions of ProTracker which don't use CIA timing, hence Fxx commands > 20 also set the tick count in those versions. It's impossible to find out if a tune should be played with VBlank or CIA timing, however in this particular case OpenMPT's heuristic seems to fail. I'll try to think of something slightly more clever...

And regarding the uploads, put your file in a sensible compression container (that is, zip or 7z) and it will work. Or, as you figured out, simply link modules instead of uploading them. AMP, ModArchive and others won't run away that quickly.

r4818 changes the VBlank heuristic so that CIA timing is again used if the VBlank timing actually increases the song length instead of decreasing it.