Appreciate it probably won't be the answer you want to hear, but if you are unable to find the files on your device using the steps provided earlier, it's extremely unlikely they will be recoverable/found at a later date.
As for a fix, I understand the frustration and I'm checking in with the QA team daily, they are doing their best to try and find a reliable reproduction of the issue on both Apple and Android which can then hopefully lead to a fix. At this stage, despite their best efforts this hasn't been possible.