By external sources, I meant some other photo sharing services like Google Photos or imgur. It's just not very convenient to having download the photo first, then uploading it to the Connect post.
I think it's a known fact that Connect has a hard limit of photos that can be posted. No matter how conservative we are in posting photos, sooner or later we will hit the cap.
I would love the ability to post photos directly from my Google Photos album, and not having it counted against the cap.I know Lithium is not a Google product and I don't know how complex it is to build the feature, but I thought it just makes sense since most Local Guides takes photos with their phone and use Google Photos for storage/ backup purpose.
As for Imgur, technically we can reference an imgur link to get the photo, but (to my understanding) it's basically getting the photo and having it uploaded, making it to be counted as part of the quota (please correct me if I'm wrong).