I implemented a Scrapy project that is now working fine locally. Using the crawl command, each spider appended it's jsonlines to the same file if the file existed. When I changed the feed exporter to S3 using boto it now overwrites the entire file with the data from the last run spider instead of appending to the file.

Is there any way to enable the Scrapy/boto/S3 to append the jsonlines in to the file like it does locally?

Thanks