Error submitting a form: "Unknown error occurred when trying to save data"

We have several forms that have been deployed and see the below error at random on user devices (iPad).

I saw in another post that this could be due to a corrupted browser so we have suggested they clear their Browser cache, check that they have sufficient storage in their iPad and/or switch browsers (they have Chrome and Explorer), but the error continues to pop-up.

According to the users, they are eventually able to submit the form, but the attached images do not submit successfully.

Are there other things we can try to resolve this error?

Thank you.

Welcome back to the community, @nhelgeson! When collecting data with Enketo, you should be able to collect data in any OS unless you use some modern updated browsers. Could you also inform the community of the browser you are using to collect your data?