I don’t want to get too deeply into this, but for three different file formats you should use three separate droplets. Droplet creation is relatively simple, but getting the output file settings correct is almost always a matter of trial and error. At least for me, because of the ambiguous wording of “override action save commands”. I haven’t done this in a while myself, so I don’t remember exactly what the settings were, but I think there were similar settings to batch processing where you can skip the open dialogue options. But once you got it correct for one, the rest are easy. You do need to drop the files three times, but,set up correctly, they will run unattended for any number of files.
Kalleheikki Kannisto
Senior Graphic Designer