Hi! I've recently bought the Pro1X. I'm posting this thread here in case someone runs into this issue in the future. During my tinkering, I noticed I couldn't flash custom ROMs. I was getting Error 7. I took a look at the logs, and noticed LineageOS (and lineageOS based ROMs like e) look for the metadata/ota directory. This could be a weird bug due to me flashing back to the stock ROM and never having an ota update applied.
How I came about this issue:
I tried out Lineage 22 and loved it! However, I had issues with RCS chats due to the increase security checks Google is adding.