There is a nice and free pdf converter in the OnDrive connector,
It is hard if not impossible to copy files from a sharepoint (group) to the OneDrive space for conversion
It is impossible to reach the o365 site files with the OneDrive connector
Best would be to have a similar Action in Sharepoint.
You can use Plumsail Documents to do this.
Some Flow examples for you:
Note: It is paid solution.
Yeah, this is a shocking omission?
You can convert to PDF but only in OneDrive for Business?
Why is this limited to OD4B. It's like the solution was intentionally crippled.