AgitatedDove14  
Stackoverflow says about the size of the file name, but here the problem is with the size of the folder name. Not sure if the file and folder limits are the same. The error that occurs says that An error occurred (XMinioInvalidObjectName) when calling the CompleteMultipartUpload operation: Object name contains unsupported characters. . At first I thought I was using the wrong characters in the task title, such as backslash, colon or space. But I managed to upload models with the task name including all these symbols when I used fewer override parameters in my hypeparameters optimization task. So I assumed that the problem is in the length of the folder. Here is an example.