Up to 8 attachments (including images) can be used with a maximum of 1.0 MB each and 10.5 MB total.
Check this - https://success.ringcentral.com/articles/RC_Knowledge_Article/2178
As per here, the RingCentral Retention Management APIallows Account administrators to customize the Data Retention Policy to ensure the organization keeps less than 90 days of message data
Up to 10 attachments (including images) can be used with a maximum of 1.0 MB each and 10.5 MB total.
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