Limitations of Archiving Files from VNX to Centera using CTA?

Follwing issue:

File Matching Expression "File Alle files":

Policy: "Policy Archive All Centera" (uses File Matching Expression "File Alle files"):

Schedule (uses Policy "Policy Archive All Centera"):

After Archiving you see that all is stubbed but one file is not:

So I ask myself: Which would be the minimum size that can be processed? Is there one? Is that documented and if yes where?

Many thanks in advance...

Kind regards,

Jens