To configure the maximum size allowed for an attachment:
Choose the cog icon at top right of the screen, then choose Confluence Admin.
Enter the maximum size next to Attachment Maximum Size'.The default is 10mb.
check the following doc
Yes, there's a limit defined in the attachments section under admin. You can raise that very high, but bear in mind that uploading and reading them is network intensive and slow, and Confluence is not a document management system, so it's not well suited to handling very large files.
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