Messages also have their limitations. If you require further assistance with attachment limitations, please contact the Symphony Support team at support@symphony.com
Attachment limitations
Based on your organization's settings, some features in this Knowledge Article may not be applicable to you. Please contact your Technical Account Manager (TAM), Symphony Support, or your internal IT team with any questions.
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The attachment limitation for each message in Google Chrome or the Symphony Messaging Desktop App (SDA) is 25MB in total, for example if you upload 3 files of 9MB each in the same message, it will exceed the limit.
If the pod has expression filters V3 enabled, the attachment limitation is 5MB in total for each message.
Note: The aggregate attachments size limit is tied to the number of regexes in use in EFv3, as well as to the number of cores per Symproxy. This can be further adjusted based on your company’s specific DLP deployment.
Messages containing more than the permitted size limit of attachments will be rejected. As a workaround, the sender should send the attachments in multiple messages.
There is no limit to the number of attachments that are allowed in a chat room. If a user is unable to see some attachments that other users can, the chat room may not have Let new members browse history enabled.

If this option is not enabled, new members will not be able to view historic messages and attachments. Once set, member permissions cannot be changed.