Hi Bills,
What you are looking for, can be achieved with the help of Acrobat DC or Create PDF subscription. I see that you are a subscriber of Adobe Acrobat DC subscription.
1- With the help of "Create PDF" feature you can convert a scanned document to pdf. ORC (Optical Character Recognition) would help you to search the text.
For detailed description, you may refer to the help document here- Scan documents to PDF, Adobe Acrobat.
2-There isn't a limit to number of pages or file size. However, the conversion speed is dependent on your internet connection speed.
Hope this answers your query.
Regards,
Akanchha