Above is from my phone.
Yes your picture is ok, but it is a thumbnail, which is fine.
After you select the picture, the pictures name will appear in the little window right beside where you clicked choose file.
Just to the right of that, click ( insert attachment 1 )
You will not see the picture after you do that.
You will see the words attachment is equal to 1.
But not exactly like that I wrote.
But with tapatalk, I believe you have an option to choose the picture size. Don't make it too large.