iPad photo editing apps without subscription

Hullo together! I finally got to order my first iPad (Pro 11")! I'm a long time MacBook and iPhone user and do a little photography now and then. On the Mac, I use Olympus OM Workspace to import and decode the RAW files. They go as TIFF files in Affinity Photo for the actual editing - I find the ORF engine in Affinity much worse than the "official" Olympus one.

Affinity Photo for iPad is a thing, but:

• importing directly could mean use an inferior RAW engine (I don't think Olympus has native iPad software for that - can the iPad even handle ORF files?)
• The V2 release was really lukewarm and I still use the V1 on my Mac. I am a bit skeptical of the software house in the long run, but I'd love to be proven wrong!

Now, do you have suggestions on how to handle an editing routine on iPad and which software to use, ideally without subscription costs?

The edited and finished photos are usually saved in Files and imported in Apple Photos for iCloud storage.

Thanks in advance!