If you use one of the online photo albums to upload pictures and share them, please tell me the EASIEST one to use that will allow big photos (high res) to be uploaded.

My former mother-in-law takes hundreds of pictures of my grandson when she has him every week and I never get to see them because they are too big for her to email. She’s not technically inclined (though she’s using a digital camera) and I’d like to have my son show her how to use an online album so she can share them all with me. 

Any suggestions?