https://onedrive.live.com/
https://drive.google.com/
From an Android/Apple/Windows Phone, you can sign into one of the services above and upload them. You can also email them to yourself from the phone then upload them to the web from a PC. Bluetooth is another way of transferring to PC; for those that have embedded bluetooth adapters.
For phones that are very basic, you can plug them into a USB port on a PC and transfer the files off that way.
Once the file is uploaded to the above service, you can paste a link back to the photo/file, in the forum.