Please add the steps required to repeat the process.
e.g. did you create a Confluence page and add 300 attachments, or do something else?
If your Confluence page has the same amount of content as a 300 page Word doc, think about splitting it up over many Confluence pages.
I did - first i create a project name and then we create table - and we keep adding data into it online. then after sometime when we realize to open this page ...start facing issue... I realize that page is too large because
i cant see the edit button etc