What does 'Processing pending document check (1)' mean in my visa application?

The phrase 'Processing pending document check (1)' indicates that one of your documents is currently being reviewed as part of the visa application process. It usually does not suggest that additional documents are required from you at this stage. The counting does not specifically represent a certain number of checks but is rather an internal reference for the embassy staff handling your application. After initial checks, your application may advance to a more senior officer for approval.