@Robin2
Have you seen this site which compares manufactures?
This is the company I use, very fast, good quality so far.
https://www.pcbway.com/
When I want to try a new company, I email my zipped files to them and ask if they are usable for manufacturing (my pcb program is quite old).
All have responded positively to the request.
This post might be of interest to you (if you can see your PCB using the gerber viewer, you will probably be okay).
https://forum.arduino.cc/index.php?topic=445951.msg3605147#msg3605147