The filesize of that image seems a bit large, or at least at the moment when You Tube and Netflix are scaling back standards to help prevent overload of the internet's resources.
For one thing you can reduce the resolution of the image directly at the device or when you process it to post.
While I understand that the wilderness or whatever might seem to demand glorious amounts of detail you really don't need so much.
Keep your uploads under 1200x900? or scale it lower until you get some success and you'll have the idea where you should be. Most users are at 1024x800 or maybe 1440x??? for widescreen and after that it's overkill.
In the old daze before images were so important many sites were at 72 dpi. Any more and Fred Flinstone had to find a larger dinosaur.
Seriously...I started when Dancing Demon on TRS-80 was AWESOME.