Adapted the comments.

infostore.properties:
# If the sum of all uploaded files in one request is larger than this value, the upload will be rejected.
# If this value is not set or -1, the more general MAX_UPLOAD_SIZE configured in server.properties will be used. If that value
# is 0 uploads will be unrestricted. The size is in Bytes.

attachment.properties:
# If the sum of all uploaded files (for contacts, appointments or tasks) in one request is larger than this value,
# the upload will be rejected. If this value is not set or -1, the more general MAX_UPLOAD_SIZE configured in
# server.properties will be used. If that value is 0 uploads will be unrestricted.
# The size is in Bytes.