Auto Transmission issue 2011 Fiesta

Intermittent problem, when engine is cold...Transmission hesitant to go to Drive ...Engine rives but not going to Drive....After warming , seems to be ok. Suspected filter problem but found there is no transmission filter in this car. Any comments appreciated

Before spending money at shop, and since there is no way to check fluid level...I will remove fill plug and add any fluid that it will take....This thing is like filling the axel case...you just fill it till it runs out and you are done.

Check the ground cable(s).