REPRODUCIBILITY (% or how often): Nearly every time
BUILD ID = OS VERSION (Settings > About product): 4.3.0
HARDWARE (XA2, X10, X10 II, …): XA2
UI LANGUAGE: Any
REGRESSION: (compared to previous public release: Yes, No, ?): No
Not able to share files, e.g. pictures in MMS.
Open window showing app that can be used
Error message: No app available for file sharing
Do you have any third-party sharing plugins installed?
That could be the issue, but I do not know what kind of app that could be. Is it a SailfishOS app or could it be an android app?
Could it be Chum or microg?
You can start with the ones mentioned in the release notes of 4.3 under Notification concerning apps from Open Repos
Good input.
But that didn’t help me 
Typical candidate would be ghostcloud additionals
I have GhostCloud installed and have tried Additionals long time ago but that didn’t work for me. Uninstalled Additionals and had no issue with File Sharing.
This is my Apps.
Just made the list, maybe a reinstall will be the best solution even if it takes manny-manny hours 
SailfishOS
Android
I guess that the issue with to many apps will be corrected in the future.
Right now I working with a reinstall and that takes many hours, far from finish (only half Finnish 
)yet.
I had the same problem, went to /usr/lib/nemo-transferengine/plugins and removed all 3rd party plugins (had depecher,whisperwish and ghostcloud plugins). Reboot was required but now sharing works.
