Don't know what the current timeout is, but it's definitely too short. I'd say increase it to a minute or so, then you can really be sure not to bother people with the message instead of the actual conversation contents.

According to Facebook docs, an appID is not required, and this plugin's proptypes improperly requires appID. I believe we only need the pageID.

See: https://developers.facebook.com/docs/messenger-platform/discovery/customer-chat-plugin/

Good afternoon.

Could someone be so kind as to show an example for sending attachments?

All of my files are local HD as *.jpeg, *.mp4 and *.doc

Reference https://developers.facebook.com/docs/messenger-platform/send-messages/template/receipt