Your photos shrink smaller instead of enlarge when I click on it.
Anyways, from what I can see, there is no new leaf growth yet. So I will not water that plant yet. Got to be very patient and wait. You can position it to a south facing window indoors for now. Typically I do not bring out my Plumeria cuttings outdoors if temperature overnight is still not a stable 50F and higher. But once I see at least one fully open leaf, then I start watering, and move it to a more sun area, and as more leaves show up onto a more full sun area.
I have learned to wait very patiently. It will do a leaf claw first, that does not count. Got to wait for those claws to open up properly. As long as that Plumeria cutting you have has no mushy part anywhere up and down that stem, it is okay if it feels lighter. Got to wait for those leaves to show up.
Example: that top part will look swelling and leaf claws forming. Still not ready, do not water yet, give it more light
This time, at least one leaf has managed to grow more and open up...time to start watering. Do it in intervals initially, then stepping it up to almost daily when the conditions gets hotter.
I also make my media very gritty and well draining. My area is different than yours. Over here we have zero rainfall for 6 to 7 months, so I have to step up watering and do it almost daily to catch up with its watering needs. But media must be gritty, and well draining. So I have added a lot of pumice and other well draining materials in the soil.
Be aware too, depending on what type of Plumeria cultivar you got, it may be more finicky than others. So your patience is your best friend.