Ticket:
It is possible to attach/send 25 MB overall ticket attachments via the ticket attachment option.
Chat:
It is possible to attach/send 128 MB at once via the chat attachment option. However, it is very likely that your or the customer's email client won't be able to accept such a large attachment, in case you will be working with the forwarded message or chat transcript.
Knowledge base:
It is possible to attach/upload max. 20 MB files to the knowledge base articles.
This size limit is related only to LiveAgent cloud-hosted (SAAS) accounts.
Self-hosted licenses of LiveAgent have an option to modify attachment size since it depends only on the settings of the web server that hosts the LiveAgent installation. E.g. if you use Apache webserver, then you can set both 'upload_max_filesize' and 'post_max_size' to the desired file size limit that is allowed to be uploaded/sent.
Self-hosted licenses of LiveAgent have an option to modify attachment size since it depends only on the settings of the web server that hosts the LiveAgent installation. E.g. if you use Apache webserver, then you can set both 'upload_max_filesize' and 'post_max_size' to the desired file size limit that is allowed to be uploaded/sent.