描画の直線がpcからAndroidタブレットに移すと消える

Hi @だんでぃ123パパ,

Hope you are doing well. Thanks for writing in!

Would you mind clarifying the "transfer the straight lines"? 

Are you referring to drawings you made on the document using your PC? If yes, would you mind letting us know if the files are saved on your hard disk, on Acrobat Cloud, or on any other third-party cloud storage?

Also, once you are done with making the lines, can you confirm if you are saving the file, and are able ot see them again on the PC if you reopen the file?

Please share a few more pieces of information for further investigation:

1. The app version of Acrobat Reader Mobile you use (go to Home > Profile > About Acrobat);

2. The Android OS of your tablet;

3. A screenshot of what you see on your PC versus on your tablet.

Look forward to hearing from you.