editing help merging 2 pics

[divineinfekt01]

i have 2 screenshots of messages that i want to look like 1 conversation, i make the picture and it looks perfect when viewed on desktop, but when i send the image to my phone, you can see the line where the 2 pictures join? anyway around this?

[John T Smith]

Please post the exact name of the Adobe program you use so a Moderator may move this message to that forum