Many email providers have a size limit for sending or receiving emails with attachments. When attempting to use the Email Medical Record feature, an alert will appear notifying you when an attachment is too large to email from the Medical Record and prompting you to use the Email Medical Record by Selection feature or select fewer records to reduce the file size.
To get an understanding of the file being sent, print the medical record to a PDF. Generated PDFs can allow users to gauge the file size and actual length of the PDF involved, which can be a useful way to determine how precisely to divide an Email Medical Record by Selection for large medical records.
Full instructions for emailing the medical record, including steps for emailing by selection, can be found here: How do I email or print the patient medical record?