Why is my microsd card not integrating with my storage?

I'm afraid that's not how SD cards work.

What you're looking at is the internal storage of your phone, which is where your apps, text messages, call logs, maybe even contacts are stored.

If you go into settings and scroll down to "storage", and then scroll down to the SD card part, that's where you'll see your SD card, it's capacity and so on. On your SD card, you can store music, movies, personal files, whatever. In other words, you cannot integrate it with your internal storage, which is the 4GB you were looking at.

If you have a rooted phone, there are some ways to move apps to the SD card and save space on the internal storage, or if you have Android 5.0 or higher, it should move some (only some, not all) of the app files to the SD card but that's about as far as it goes. So to answer your question: no, SD cards are not necessarily supposed to "widen" your storage.

Hope this helps :)

Well first i have no idea what your placing the card into or what kind of system you have but i do understand a few things.

The SD cards generally dont make good storage solutions, they dont last very long.

The card could be defective or the wrong type, some devices wont accept a 16GB card.

It would help others to answer better if you gave an idea of the make and model of the storage system, such as smartphone model xyz 2015 or webserver running debian etc.

SD cards do not affect RAM.

What device? What OS? What version?