Don't know if it would be of much use, but you could get program "DreamTerm" from aminet for Amiga. It can display all serial communications that's happening (So, you can see, if any data sent by your PC actually even reaches your amiga...)
In addition, you might want to get "DMS" from Aminet, and (maybe some dms disk images while you're there). A .dms file is a "compressed disk image" and most of them should fit 720k PC formatted floppy (while ADF's do not)
You could first copy DMS to Amiga, then copy a DMS disk image to amiga, and enter "dms write file.dms", insert empty disk and hit "enter"
Oh, maybe it's also worth mentioning, that sometimes dms contains only half a disk. In that case, you obviously need "both halves" to write a fully working disk :-)