Hi, A yellow triangle usually means that Aperture cant find the original file. I'm afraid you will have no option but to search through your backup drives. I realise that could be a tedious process but there is no other way.
Can I open the files in photoshop and alter them there?
It worked. I opened the file in photoshop. saved it as a copy and then moved it to dropbox!
I didnt save it in aperture. I saved it to my desktop and then upload to drop box. before whenever I tried to move an image it would give me a circle with a line through it
Heres the trick: open the same library in adobe bridge. All images appear.
Then look for photo in aperture. Find same photo in bridge. Edit in photoshop. save as copy to desktop. upload form desktop to dropbox. Easy!
Any job openings? lol