Basic scenario right click Video folder, select Add existing files.
Sometimes it lands me in Windows\System 32\ pointing at the empty Configuration folder (which is a very odd place to land), other times it lands me the Program Files\Sigil. Neither location is where I ought have my video files. In Windows the designated location for videos is %userprofile%\Videos.
If in the file open dialogue I right click a file Sigil crashes:-
then
Why would I right click it... to play a bit of it to make sure its the right one.
Happens in ePUB 2 and 3. And with Audio files, probably happens with all file types. It's not unusual, for me at least, to open files in open file dialogues, I do it a lot, have done for years.
Aside : Would it be possible to give File New a submenu for ePUB 2 or ePUB 3. Bit of a nuisance having to change the 'standard' preference and then having to remember to change it back.
BR