Yes, that's entirely possible; for example, there are blocks such as: Last exchanges created, Last modified exchanges, List of tasks…

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There are several possible reasons:

• You don't have permission to view all tasks.
• There is a filter applied to the task list (completed tasks, tasks not assigned to you, etc.). Click the "X" next to a filter criterion to view all tasks.
• The list is paginated: scroll to the bottom of the screen to view the rest of the tasks by switching pages.

There are several possible reasons:

• The document the maximum allowed size (500 MB by default)
• The file type is not accepted