Why doesn't ydcmd send files to Yandex.Disk?

Question

System administration

I think many people know the ydcmd script, which helps to manage and synchronize folders and files from the linux console with Yandex.Disk. I installed one myself to set up a backup. I run the script - everything works and downloading and creating directories, except for the put command. That is, the script starts, hangs in the processes that work, does not give any errors. What could be the reason? There is a suspicion of a hoster who has a paid regular backup service - could this be the problem? And if so, how do you know for sure that this is a hoster, so that you can poke your nose later?
And if not a hoster, what else can interfere with the transfer?
PS I set up copying to mega.nz without problems, but this is not the most popular cloud in our country and can the hoster ignore it?
VPS on Ubuntu 16.04.6 LTS