A curious thing is happening and I can't work out why.
Firstly, I have had endless trouble getting my Kobo Forma to connect to my PC and Kobo support was perhaps the most useless support I have ever experienced. In the end I found that one USB port (out of 9 on my computer) works and just one specific cable (not the Kobo supplied one). On my mac, it just worked. Ok, rant over, now onto my Calibre problem!
If I sync books from Calibre to my Kobo, these books end up in the recycle bin. At first I didn't notice and would empty my recycle bin without checking and then wonder why the books were completely disappearing from my Calibre library and computer! Now I realise they are going into the Recycle Bin but I cannot see how or why that is happening. Does anyone have any idea what I'm doing wrong?
Further info that may help:
When I plug in my Kobo I often get the error from Windows 10 that there is a problem with the device and that it needs to be scanned. When I scan it, it says no problems were found
I have a Kobo Forma, Windows 10, Calibre 3.46 and the following extensions: KoboTouchExtended 3.1.5, KePub Metadata Writer 3.0.3 and Kobo Utilities 2.8.0
Edit: books are stored on a hard drive and I only add books through the Calibre app (by dragging and dropping them into the library in the app)