The project that this occured on is now fixed. The README limit is 1000 characters. To get this error message solved, I had to reduce from 999 to about 960, which seemed to work but then when I needed to make another amendment and saved again, it would only accept 930. I went back and forth trying to make random changes until eventually accepted my save.
Could it be that I made too many edits and Epicollect didn’t like this?
Or is there a certain format your text needs to be in if copying and pasting? I cleared formatting on notepad so there was no different formatting.