Hi Colombo, welcome to ICMag!
When you insert an image from your album you have several options available if you're using the "insert image" button next to the message box under "Go Advanced". Make sure you select the full image to place, and not the thumbnail. That is using the Full Site template.
When using our mobile template, you will be presented with your albums, then the images in an album. When you click on an individual image in the album it will then go full size. If you can, just drag the image into the message box. If not, then copy the image url and paste it into the post using the image icon:
All images that are bigger than our limits will be resized on upload and EXIF info removed. Your limits will go higher once you go from newbie to member to supporter.