How can I quickly transfer ownership of files in google drive to another person?

Question

Google Drive

Brief background: at my last job, everyone used Google Drive for file sharing. Not GD for Business, not G Suite, nothing. As a result, I have accumulated thousands of files of various kinds (as well as Google Docs/Sheets "files") where I am listed as the owner.
This all affects the free space counter and on the main pages of docs and tables ( https://docs.google.com/document/u/0/ ) there are a bunch of files that I no longer need. I can’t delete them, since they will no longer be available to others, and changing the owner in GD does not work recursively , so even after I was deprived of access to the shared folder, little has changed for me in general.
I want to somehow transfer ownership of all files/documents/folders to a specific person who works there, but I don't know how.
All files are available to me in the quota
section . Sometimes I can’t even just take and change the owner (most likely because the file is in a folder that is already inaccessible to me):
GD has an extremely poor interface and I’m afraid this task will be impossible without third-party tools.
ps It gets to the point of absurdity, I can't even see where this file is, GD just tells me "Yes, you have such a file, I won't let you change the owner, I won't tell you where the file is, accept it.":

Answer 1

Check out the following background information.
How to change the owner of a file or folder
How to free up or increase Google Drive storage
It follows that you can transfer rights only to files of supported formats, the so-called. "Google Drive format files".
The easiest way is to put all the files in one folder, select them and change the owner, while the current selection should not contain files of other formats and files that do not belong to you.
Other files (other format) will have the same ID only on your Drive and nowhere else. Those. when transferring rights in any way, new files will be copied / created with other IDs.
In this case, one of the methods of data transfer is direct copying. You collect all the files in one directory, and the new future owner copies them. The method is not without drawbacks. For example, all files will have names that start with "Copy".
It is very strange to hear that an organization used a sharing system without rights control. This is a serious omission.