some "isolated" type programs (and Printmaster is like that)
they typically save to their own file type.

When you "save" and it asks you for a name, there is another
box below with an arrow. Click on that and see if .gif is
available for that project. (or jpg)

Specialty programs will save to a bitmap when other types are not there. Bitmaps are typically large and hard to post.
.jpg compress and change vector/raster commands once done (merges them).
So some programs do not allow jpg either.
IF you look at our attachments, .gif allowances are small too.
GIFs often have moving graphics, and that makes them large.
I always post in jpg format here.

Printmaster is not a good graphics program for all around
work. Esp for photos.
I suggest you get another program.