Currently there is a limitation of uploading a file attachment size to max of 10 MB. SInce SPO can accept upto 250 MB per file in a list item, it makes sense to increase the attachment size in PowerApps to 250MB.
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Hi Everyone,
We've removed the limit for attachments to support higher upload limits, as they become available by different connectors. It became available in 6.4 - Released version 3.21064 - Release Notes | Microsoft Docs
Hope this helps.