For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
Dropbox - Online Sync and File Sharing
GIMP - GIMP is a multiplatform photo manipulation tool.
Google Drive - Access and sync your files anywhere
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
Mega - Secure File Storage and collaboration
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.