Until recently, there were several ways to upload your photos to the best, in my humble opinion, Flickr photo hosting — downloading "one by one" via a web form or installing an extremely primitive program from the photo hosting itself. Then, by the will of fate, downloading via the Flickr site became extremely convenient, the progress of the entire download and each file separately is shown, few people need additional tools. However, there is a small problem — the difference between a local photo album with folders from what you get online. FlickrSync can solve this problem.
The main charm of the program is that you synchronize local folders with photos with sets in Flickr. I.e. to upload a lot of photos to the photo hosting, you need to tick the folder, then a set will be automatically created on the photo hosting in accordance with the name of this folder and all photos of this folder are "filled in". When downloading, you can also choose how to name the set, if you are not satisfied with the name of the folder, describe the set, set access rights to the set and some other useful parameters.
When installing the program, it is mandatory to have live Internet access, since the program checks something there for version compliance, as well as for authorization on the Flickr API.
In summary, I will say that FlickrSync is the best program for those who believe that sorting photos by tags locally and remotely is the best way to keep everything in order. For those who sort photos by tags, the program will not bring much benefit.