We've done potc several times with our own adaptive stroller. It' always there waiting for us at the end of the ride
we have with our daughter’s wheelchair too.
The POTC is not ECV accessible, but the line to get to the boarding area is completely wheelchair accessible.
They ask if you can transfer to one of the attraction wheelchairs because that is easier for the CMs.
But, if you can’t, they will transfer your wheelchair for you. The unload area is in a different building and is one floor down compared to the listing area.
After you load, a CM takes your wheelchair outside of the ride, through a backstage area and down an elevator to get to the unload area. It will be waiting at the unload area for you. After getting into the wheelchair, you take the elevator back up to ground level.
For attractions where a Return Time is given for guests using a wheelchair/mobility device, the procedure differs a little based on whether or not you have a Fastpass for that attraction and what the Standby Wait Time currently is.
If you have Fastpass, go to the Fastpass line.
For Jungle Cruise, the CM will tell you to scan your Fastpasses and then give you a ticket to get into the accessible line immediately. Without Fastpass, your ‘ticket’ will be based on the current Standby Wait Time. If it is short, your ticket will let you get into line right away; if not, the time written on the ticket will be approximately 10 minutes less than the current Standby Wait.
Space Mountain and BTMRR work the same way.
Small World works the same way, except the CM at the entrance to the regular line usually has a handheld reader to read your Fastpass and is the one making out Return tickets. Some people do just go into the exit if there is not a CM right there, but our experience (over many times riding) is that if there is a CM assigned to that station, they do check for a ticket before allowing your group to come into the area. We have seen the CMs turn people away who do not have a return ticket,
At Epcot Spaceship Earth, you go to the exit. That is the one where Fastpass doesn’t make a difference; the CMs there keep a list and will tell you how long your wait will be. If the wait is short, you can just wait in the seating area at the exit. If the wait is longer, your name is on the list and you can leave and come back closer to the time when you would be going in.