It seems that DTO is limited to 7 levels of subdirectories. Any attempt to index files further in the folder architecture send back “failed”. This is quite a limitation especially for a database that is stored on an external harddrive as already 2 to 3 subdirectories are already taken, e.g.
You’re running into some other limit (likely a buffer limit set by DT), not a limit on folder depth. Try this: create /a/b/c/d/…/z (i.e., a 26-deep folder hierarchy a through z) and index/import it into DTPO. It works. Try this test: select a point deeper in your hierarchy.
One of the key point in making this pedagogic database is that a young engineers can place himself most of the interesting document at the right place in the folder architecture, this the explicit names that have been used.
If DTPO is directory length is limited in size, it should be easy to extend the buffer and remove this limitation. Would that be possible in the next version?