I want to use this to store pictures from my android phone. Is this easy to use? Im not tech savvy at all.

No, this is a USB-A thumb drive, the larger port on all computers. Many newer better android phones have USB-C (small, oval shaped). Most still have micro-USB (small, trapezoid). The easiest way to tell the difference is if you can flip your charging cable upside down and it still plugs in then it's C, otherwise it's probably micro-usb. I would google photos of the ports to verify. Anyway, there are several thumbdrives that have USB-A on one side and USB-C or micro-USB on the other side. You could also get an OTG adapter for this thumbdrive to plug it into your phone. I'm not sure what software would transfer your photos to the thumbdrive, but I'm sure there are 1000 different options. The built in photos app lets you select days or individual photos and 'copy to folder' on an external drive. Other software might automate the process by copying them all when you plug in the drive. Personally I would recommend Android's built in backup&sync. It will upload your photos when you're on wifi. I think it's on by default, so you should go to google's photo webpage (amazon won't allow link), and log in with the same account you use on your phone and see if all your pictures have already been uploaded. If not, it shouldn't be too difficult to find instructions for turning on backup&sync for photos. On mine there's a switch in the photos app when I look in the 'Camera' album. FYI: uploading doesn't mean they're shared. Unless someone takes a great interest (time&money&hacking) they're pretty safe. Micro-usb: https://www.amazon.com/Samsung-Flash-Drive-MUF-32CB-AM/dp/B013UHK0TK/ USB-C: https://www.amazon.com/Samsung-Duo-Plus-256GB-MUF-256DB/dp/B07DW2Q1JL/

How hot does this get? That happens to be my main concern as of now with alot of these "low profile" drives, planning to use with a raspberry pi

It works great with the Pi. I have one that I use with my Pi 4 and Pi 400, and it doesn't seem to heat up at all. It's also much faster than many other drives floating around.

Can I install a Mac OS, option boot On startup and use it as a hard drive?

Yes. I installed macOS High Sierra on it and can start up from it whenever I need to use that OS. It works great and the speed is fine.

What is the default file system formatted as?

If you store files larger than 4GB, like video files, FAT32 is old technology that won't store big files. ExFat is much better, no file size limit. If you try to use FAT32 on something that stores video or DVR files, it might not even tell you about the file size limit, it will simply stop recording.

Connectivity Technology	USB
Color	Gray
Model Name	FIT Plus
Product Dimensions	0.29"D x 0.93"W x 0.29"H
Flash Memory Type	CompactFlash
Manufacturer	Samsung Electronics DAV
Hardware Connectivity Technology	USB Type A
UPC	887276265940
Global Trade Identification Number	00887276265940
RAM	256 GB
Hard Drive	256 GB
Item model number	MUF-256AB/AM
Item Weight	0.112 ounces
Item Dimensions LxWxH	0.9 x 0.7 x 0.3 inches
ASIN	B07D7Q41PM
Is Discontinued By Manufacturer	No
Date First Available	July 1, 2018

MUF-256AB/AM FIT Plus 256GB - 300MB/s USB 3.1 Flash Drive, Gunmetal Gray

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