on the imgflip image generator when you go to upload a drawing, you can press "flip" and it'll mirrow the image (As seen in the image) so thats a way you can fix your reverse problem.
but really it doesn't matter unless you have text on the image.
I NEED YOUR HELP!!! When i try to post a drawing, it comes out backwards with the camera. if you know how to fix it, please say in the comments. Thanks for reading.