MS-250 Port-Mirroring

[TRACERT1]

I understand how to set up port-mirroring by going to SWITCH>MONITOR>SWITCH PORTS and checking the ports I wish to mirror then clicking MIRROR, entering my SPAN destinantion port and clicking CREATE MIRROR.

That said, will this mirror both incoming and outgoing traffic from the selected ports? 

I saw a section in the Meraki help files on port-mirroring that mentions EGRESS MIRRORING modes, and states the MS-250 mirrors only does Tagged Egress tagging the Native VLAN.  What does this mean?  Does this mean I can only SPAN the Trunked uplink port which has a native vlan if I want to see the egress traffic?

[PhilipDAth]

My recollection is both inbound and outbound traffic on every VLAN on the source port will be mirrored.

On the destination port, all captured VLANs will be presented.  The native VLAN will simply be tagged.