Android SDK not found

Hi, im currently using Unity 2019.3.15f1 and this error came to me when i tried to build my project into apk. I heard that there's an android SDK bug related to this version but i dont know if mine is count as a bug.

Yersterday when i tried to built my project the Android SDK not found error came up, i followed others solution and it worked perfectly after. Today when i tried to build it into apk this problem came up again, i tried several solutions and it still didnt work.



Here's what happened before:
- I tried to build my project into apk, and Android SDK not found came up
- I followed some others solutions from another threat with the same problem as me and it still didnt work
- I downloaded Android Studio, copied the SDK path C:\Users\ACER\AppData\Local\Android\Sdk paste it to unity SDK path, the warning that says something about does not support third party still showed up
- i pressed build and the Android SDK not found gone, but another error message came up. It still related to SDK but i forgot what the name of the error.
- I messed around with the preferences setting (following others solution) pressed build and Android SDK not found came up again

It's been 7 hours since the first error message came up and i havent fixed it yet. I just want my app to be released before new year but this error have been making my progresses very slow. All responses greatly appreciated.



Extra Information:
- I've searched for keyword "sdk" in my file manager and only from unity default came up C:\Program Files\Unity\Hub\Editor\2019.3.15f1\Editor\Data\PlaybackEngines\AndroidPlayer\SDK. I also changed the slash from "\" to "/" and still didnt work
- I tried restarting my Unity several times and it didnt worked.
- I used unity remote before the error message came
- I followed some "easy" methods (e.g changing the preferences setting) and none of them worked. I havent tried the hard methods (e.g changing java something like that) except downloading Android Studio

Just want to confirm, does Android Studio SDK has their own folder in file manager? Because mine doesnt show up.