How to upload better quality photos

[greenhouseFrog]

Since I have started posting, I’ve noticed that the quality of my uploaded photos using the attachment feature isn’t anywhere near the quality it should appear at. This is more than likely just a user error, but is there an efficient and effective way of posting pictures so as much detail as possible is apparent to other users? Maybe I just have a skewed view of things because I use this forum strictly on mobile devices…Any thought?