It is not uncommon for them to stick. After you unroll a bit, you should be able to tap the aluminum rails and it should pop out, then it will continue to unroll as you drive the motor.
What actually keeps the awning open is the gas strut. When the awning is closed the strut is parallel with the rail. If there is any resistance, the struts just cannot overcome the initial friction.
I found I need to lube the rails at least once a year. I have tried a few different lubes, spray silicone seams to work just as well as anything else.
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