@CHEH YIH LIM I think you are using extract text processor to extract the content and keep as attribute to the flowfile if yes then change Maximum Buffer Size 1 MB Specifies the maximum amount of data to buffer (per file) in order to apply the regular expressions. Files larger than the specified maximum will not be fully evaluated. Maximum Capture Group Length 1024 Specifies the maximum number of characters a given capture group value can have. Any characters beyond the max will be truncated. These two property values as per your flowfile size. - If the Answer helped to resolve your issue, Click on Accept button below to accept the answer, That would be great help to Community users to find solution quickly for these kind of issues. ... View more