Currently, file attachments are stored with their absolute path on the file-system. This makes it impossible to use a GC environment (datafile and attachments) cross-plattform via sync (dropbox, git, etc). Syncing on the same plattform, also is difficult as you need the same pathes as well.

Some ideas:
- Pathes are stored relative to the gnucash file
- Files are kept inside the datafile / -base
- Usage of environment variables