Thanks! I do the same, and normally the accuracy/precision value is imported into the app. I just checked with both versions of the iPhone app and both are working ok with this workflow. If you can replicate, it would be great to file a bug report including your phone model, operating system and app version, as this is likely affecting many other users too.
I did find some 40-odd of my >13,000 observations lacking an accuracy value through Diana’s link, so it’s not clear to me if this is an intermittent bug, occurs in only some versions of the app, or something else.