When you attempt to import attachments or content into Salesforce, you may receive an error: "Maximum size of request reached. Maximum size of request is 52428800 bytes."
In most situations, the batch size limit via the API on Attachment or Content import is about 50MB. 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 Data Loader Settings menu or reduce the size of your import file.
For more information on setting the batch size for the Data Loader, please review Configure Data Loader.
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