Aperture folders and projects

Question

After importing my photos from Aperture to Photos, my file and project structure is missing. How do I recover this? can I recover this? Thanks.

Answer 1

All metadata is Image-specific.  The Image "owns" its metadata; wherever the Image is, its metadata is there with it.
There is no default template or auto-organization feature in Aperture.  How you organize your Image collection (using Projects, Folders, and Albums) is entirely up to you.
Re-organizing can be fairly efficiently done.  Create two new top-level Folders, named something like "Old Organization" and "NEW ORGANIZATION!".  After designing the Library structure that best meets your needs, slowly and methodically move Images and containers from the containers in the "Old" Folder to the newly-created containers in the "NEW" Folder.  When you are done, you should have no Images left in the "Old" Folder.  Delete it.
Above, Frank refers to "Split View".  I'm fairly certain he actually means one of the views showing multiple Browsers.  I suggest doing this.  Note, however, that you cannot drag from Browser to Browser (at least in 3.4.5).  Your "drop target" must be an item on the Library Inspector.  And don't forget List View, which is also usually helpful when creating a Library structure.
Of course, you should never use any computer file without having a backup.
Additionally, I suggest running "Repair Database" before you start, and after you finish.
For a concise overview of the parts of Aperture and how they relate, have a look here.
I have additional comments regarding Library structure here.
HTH,
--Kirby.