This is how the flex should be positioned prior to final assembly.
[image|1788131]
Some suppliers fold it over and adhere it to the digitizer beforehand while others let you do it yourself. It’s hard to say from your picture as it is not clear enough. If you have to adhere it yourself, keep in mind that the flex (the portion with the connectors) has to do an inside-out for it to be positioned properly.
Also, check out this answer ([post|547310]) I provided earlier for some general “best practices” on iPad re-assembly.