I Have imported a powere point file to both local and adobe cloud and try to convert them to pdF (using iPad). It redirects me to the monthly subscription service and i follow the steps and it confirms I am already a subscriber. But it does not allow me to convert the files
Would you check your confirmation email to see which online subscription service that you purchased? Is it Adobe PDF Pack or Export PDF?
Adobe PDF Pack is for converting (a) from other file format to PDF and (b) from PDF to other file format.
Adobe Export PDF is for converting from PDF to other file format.
In order to convert a PowerPoint document (or Word, Excel, RTF, JPG, PNG, etc.) to PDF, you will need the Adobe PDF Pack subscription service. Is that what you have?
Would you also make sure that you sign in with the same Adobe ID that you used to purchase the Adobe PDF Pack subscription?