How do you draw E-R diagram for file sharing system?

To draw an Entity-Relationship (E-R) diagram for a file sharing system, first identify the key entities such as Users, Files, and Permissions. Define the relationships between these entities, for example, a User can upload multiple Files, and a File can be shared with multiple Users. Use diamonds to represent relationships and ovals for attributes, ensuring to include primary keys for each entity. Finally, connect the entities with lines indicating the relationships, specifying cardinality (e.g., one-to-many, many-to-many) as needed.