Attachments have file size limits. While we would still encourage keeping file sizes small, if you do need to send a larger file, attachments have file size limits. For files larger than 10MB using a link should be a rule. Attachments can use up a lot of storage.
Welcome to TDOP. The Teaching Dimensions Observation Protocol (TDOP) is a customizable observation protocol can be used to produce robust and nuanced depictions of the dynamics that unfold among teachers, students, and technologies in the classroom.
IMAP Protocol: IMAP (Internet Message Access Protocol)  Is a standard protocol for accessing e-mail from your local server. IMAP is a client/server protocol in which e-mail is received and held for you by your Internet server. As this requires only a small data transfer this works well even over a slow connection such as a modem.