Today, saw the post regarding modified images not uploading. No problem updating existing images. Android version 4.4.2. Kernel version 3.4.67. Profiler Version 1.2.4, build 65. Edited images were the only change to existing data.
New tablet. Installed Profiler yesterday and took about 1 hour to upload about 5200 profiles. Hi-res thumbnails selected but low quality observed. Turned off Hi-res and rebuilt; no change. Selected Hi-res and rebuilt again, Hi-res thumbnails now proper.