Reader Mobile does not flatten / lock fillable fields after signing

[Fudge]

I created a fillable form on Acrobat Pro DC for technicians to complete on site and have the clients sign with a wet signature on acrobat reader mobile 20.5.0.13673. 

When selecting fill and sign and creating the drawn signature,  a pop up appears saying "Forms with signatures or intials will not be editable once saved". However, once placing the signature and sharing the file, the file is still editable? Reader mobile automatically saves the file, but even after exiting the app and reopening the file, it is still editable. 

Is there away to flatten the file upon sharing? 

Alternatively, does anyone have a java script that will flatten / lock fillable fields and submit the form (as a button) that works on Reader Mobile? 

[Bernd Alheit]

Acrobat Reader for iOS does support following Javascript:

https://www.adobe.com/devnet-docs/acrobatetk/tools/Mobile/iosapi/classes/Doc.html 

[ls_rbls]

The only way to flatten a PDF using the Acrobat Reader mobile app in Android OS or iOS devices is to Print to PDF.

Otherwise, even if  you go online, and sign in to the Document Cloud to try to do what you're asking Adobe will open up Adobe Acrobat from your desktop computer (with your permission of course). So you'll need to implement the javascripting in your PDF using the Acrobat Pro desktop version, then going to File-->> Save as Other...-->> "Optimized PDF" --->  select "Mobile" from the dropdown provided by  the PDF Optimizar dialogue box