Today I transferred from webtrees V. 1.7.17 to V. 2.0.10. In version 2.0.10 I could only see the errors in the photos. Example:
SQLSTATE : Integrity constraint violation: 1062 Duplicate entry '1-M10' for key 'PRIMARY' (SQL: insert into `wt_media` (` m_id`, `m_file`,` m_gedcom`) values (M10, 1, 0 @ M10 @ OBJE 1 FILE Kaete_Pries.JPG 2 FORM jpeg 3 TYPE photo 1 _PRIM Y 1 CHAN 2 DATE 08 MAR 2008 3 TIME 18:54:07 1 _UID E263C00356374FE6867BA8D84AB8EDBEF8C2)). In September I was still able to work a little with version 2.0.10. I was not satisfied with that and stayed with the webtrees version V. 1.7.17.
* you edit your data using a desktop application and transfer to webtrees via GEDCOM
* you add media objects in webtrees
* your desktop application does not support media objects (and deletes them if they exist).
* you want to combine the edits from the desktop program (without media) with the media added in webtrees.