Androsaur

I went to open the file to continue to work on it and Affinity told me there was a new version available so I downloaded it and reopened the project I was working on. After an hour or so working it it (copy, pasting, placing, changing setting, etc) I went to save and got the cannot save message, trying save as gave the same results.

I can't save a project that I am working on. I started the project in 1.9 but after downloading 1.10 and continuing to work on the project I can no longer save (or save as)