I don't know if Samsung's own Gallery app has an option to resize a photo, but if it doesn't, then you could always install Snapseed (which is from Google as well).
I don't know if Samsung's own Gallery app has an option to resize a photo, but if it doesn't, then you could always install Snapseed (which is from Google as well).
The stock gallery is in play store
When you open that picture in gallery at the bottom is a pencil , tap it to resize it . Does it give you 2 options to upload to eBay? Gallery and Google photos?