Hello again @Ya_Kha,
I'm sorry for not replying sooner.
If the internal storage of your phone is as full as you say it is I would say that it is very likely that what you are experiencing is related to this.
Everything will unfortunately not be possible to transfer to the SD-card. You can use the built-in feature to transfer as much as possible by going to Settings > Storage > Transfer data to SD-card.
In order to free up memory on the internal storage there are a few things you can do.
- Delete stored cache, go to Settings > Storage > Internal storage > Press Cached data > Clear/Delete. Note that some apps will redownload cachedata as soon as you start them again. However this is a good way to free up memory without the risk of losing any personal data. Deleting the cache doesn't delete any user data stored in that applications. The application might need a bit longer to start up the next time. This is not perceivable in most cases.
- You can uninstall apps or updates for the apps, go to Settings > Apps. Here you will be able to find all of the apps installed in your device. You mentioned that you had tried clearing data for a few of them. I suggest that you go through the list of apps and see if you find anything that you are not using and check if you can uninstall the app or its updates. Note that this will not be possible for most preinstalled apps.
I also recommend setting the Camera-app to automatically save photos on the SD-card.
To change data storage for photos
Activate the camera.
Tap the Settings icon, then select Data storage > SD card.
In order to manually transfer data from the internal storage of your device to an SD-card there are two ways to proceed. You can do this either directly in the phone or by using a computer.
Doing it directly in the phone requires that you use a File Manager application, simply open the file you wish to transfer and copy the file. Then open a desired folder on the SD-card and paste the file here.
Using a computer is similar. Using a computer running Windows you can drag-and-drop files using the preinstalled file explorer in Windows. If you, however, are on a Mac you will need our program Xperia Companion in order to manage your files.
Let me know if this helped!
