Hello Thessah,
Sorry for the delay in response to your query and apologize for the inconvenience caused.
Adobe Scan on iOS requires iOS 10.0 or later and is compatible with iPhone and iPads that are 64-bit.
For Android, it is available for 5.0 and above. You can use the Scan feature in Acrobat with 4.X devices, but it has fewer features.
For more information and for download, you may refer to Adobe Scan app, scan documents to pdf | Adobe Acrobat DC Link: https://acrobat.adobe.com/in/en/acrobat/mobile-app/scan-documents.html
Hope this helps, and keep us posted if you need more information or any other assistance.
Regards,
Anand Sri.