Hello Galaxy..As we've seen with new instagram update our stories getting curved like iOS. To diffrentiate Instagram from Galaxy store ( Should be asked to uploaded by Meta ) which has features like watermark , unique fonts , some other Galaxy exclus...
You can do it , but not as easy as holding for 2 to 3 seconds. Do that manually from Gallery app. You can use this feature. I'll let you know how if you need. I'm using F23 as well. ❤️