Select all messages in a conversation and be able to unselect the ones you want

Kenanyonehelpme wrote:

Select all messages in a conversation and be able to unselect the ones you want to keep

No, you can't select all and then unselect the ones you want to keep. However, you can do the reverse.

If you press and hold on a message and select "More" from the pop-up menu, you'll be able to select all the ones you want to delete fairly quickly, then tap the trash can icon in the lower right corner.

No I was looking for a way earlier but it then dawned on me that messages are encrypted once they leave your device. You can do screenshots of the ones you can see on your screen.