Toward the end of this old but updated thread
http://form.pbase.com/viewtopic.php?f=7&t=32807 in the Features Request forum section there is a discussion about the IPTC data in a file being loaded into the caption and title fields. Of course, you still have to put the information in those fields.
Funny, when I first became entangled with computers, a file name beginning with a numeral or with any spaces in it was not permitted. I believe what we see as a space in a filename today is actually passed over the Internet as some sort of escape sequence code, not a simple space. I suppose it might be possible for the PBase uploading to translate that, but there's not much enhancement around this place of late. I've never noticed this bit with the spaces because being an olde guy, I put an underscore in the file name where we might want a space!
DaveT