We are a medium size community garden and have created a dropbox so members can share photos of the garden. We want to use these photos to update our website and make it look more current. A lot of people take photos on their phone, but we don't want everyone to have access to our dropbox, just the dropbox folder, which I know I can share via link. However, how can people add their photos not from their laptops but from their phones using only this link? Does anyone have a solution for me? Thank you so much.