Photoshop on IPad Pro is reducing file size

When I edit & save a file from Photoshop on my Ipad Pro, the file size is being reduced. I edited & saved the same photo in Photoshop on my desktop and it was not reduced. So, the Photoshop app for iPad is reducing my file size & dimensions at export/save. 

Is this just how it is with Photoshop on iPad or is there a way to make sure it doesn't reduce my file size? I was opening from and saving directly to an external SSD on my iPad.