Update (2020/05/27)
Most of the issues I’ve come across are now fixed. This should be working on recent iOS devices now. In case issues still arise, I’ve setup some logs and errors reporting directly visible in the UI. Logs are visible with a button on the top left corner, and errors with a button on the top right corner as in the following screenshots.
If you are using an up-to-date Firefox, Chrom(e/ium) or Safari 13 browser you can copy the content of the logs/errors directly by clicking on the “copy” button. This makes it easier to report potential issues.