I try to import a confluence site (export from confluence server 5.10.2 ==>Documentation).
I select the file and clicked on "Import". After about 3 minutes I'm getting an error (see this picture)

In englisch: "An error occurred during the import. Please try again or contact the support."
I selected the zip-compressed folder I downloaded from the export from confluence server, and this file is 165 MB (The limit is set to 200 MB).
Do you have any suggestions?
Thanks in Advance