I have been uploading and editing my photos from the Picasa extension with Chrome for some time now. The thing I really like is I can edit photos on the fly that are embedded in my web site. You go to you Picasa photo storage at Google with your chrome browser using the extension /click on a album ,,. get to the link - Select photos from your computer link in the drag and drop window. I am guessing because chrome book runs on Linux in the background and Linux would see a USB port at a mount point. It would mount a USB flash dive. If it didn’t why would USB port be there? Clicking on select photo link should open the USB drive contents in a pop up window. Select a photo and click up load. This is worth a try. Put a photo on a clean flash drive and stick it in to your Chrome Book. If this works it should also work for a USB card reader for SD cards. I run a chrome browser on a window XP machine for working, witting, and programming in HTML5.