Error: Maximum size of request reached. Maximum size of request is 52428800 bytes.
|Knowledge Article Number||000002608|
When attempting to Import Attachments or Content you may receive an error stating: "Maximum size of request reached. Maximum size of request is 52428800 bytes."
In most circumstances the Batch size limit via the API on attachment or Content import is ~50MB. So if you have selected a large batch size and a batch's content exceeds this total for any given batch you will receive the error.
To resolve the error set the batch size limit to 1 in the Apex Data Loader Settings menu or alternatively reduce your import file's size.
For more information on setting the batch size for the Data Loader please visit this article Configuring the Data Loader.