My suggestion is to use a "photo host".
The benefit of using a photo host is that the host typically manages the issues around resizing from the [potentially large] modern pixel counts, and
should handle uploads from phones easily. Using a photo host also means that the WW&F servers are not burdened by storing and serving up those images, therefore WW&F server resources can be less robust (and may be lower cost.)
There are many such sites, including Flickr, Photobucket, Imagur, etc. Some charge fees, and others are no fee. I find that Postimage.org works well, and is free. Most of the time I upload to Postimage with a desktop, but loading directly with my Android based phone works well also.
There are more details in an earlier post I made here:
https://forum.wwfry.org/index.php/topic,3337.msg40937.html#msg40937
