What are the filesizes of the ones you want to post?
You can use this super simple image resizer - it’s what I use cuz it resizes while maintaining good quality AND removes EXIF info:
http://www.rw-designer.com/NT/6.0/PhotoResize400.exe
Just download that file, rename it to “PhotoResize3000.exe” since the number at the end controls the resolution in pixels, and then drag and drop your pics onto it, let it do its thing in a command window that pops up. It will resize them all to MUCH smaller filesize, and rename the output files -3000. You can then upload them easily.
If you want bigger resolution pics, change the number in that file’s name to a bigger number. I find that 2560 is pretty good and is small enough that the site won’t fuck with them TOO much. Anything over 1MB filesize gets resized automatically, but @LemonadeJoe said he is working on optimizing this still. I think the max size is 10MB? I forget.