You can flag a field as a "file" type, and that will point to a record in the "attachments" table, or whatever. It can be any sort of file, not just an image file, and each attachment you add to a link, must have it's own field in the link record -- so if you want two attachments per link, you need to add two "File" fields to that link.
If you need just an image attachment, either in the logo or the body of the link, my attachment mod is more complete in this respect. I have it working on several sites, have sold quite a few copies, but never get any feedback on it. Any changes/updates are non-user driven, without the feedback, but the module can be modified for specific uses. I'm thinking of adding in the "make thumbnail" feature, so that when someone uploads a logo that is too big, rather than generating an error, it makes the logo the right size.
The break up of the Image Gallery mod went well, and with about 10 minutes of debugging, it ran just like the pre-break up version, but now that it's in modules, adding/changing the logic will be easier -- adding "type checking" for other types, and such will be much easier. I may finally have a demo out to show what it can do.
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