Quick update:
I did shut down Evernote and then the iPad - but this didn’t change anything.
However, it looks like I’ve found a solution. In the tablet’s settings, under “Evernote > Photos” I’ve changed the access to “None”. This seems to have sorted it out.
I’ve also realised that, in Evernote settings (within the app), the Camera option (see earlier post) is actually greyed out (set to “OFF”) so I can’t access it.
Thanks for all the prompt input.