The internal memory fills up very quickly and the more often you clean it, the faster it fills up.

[Olya-N]

Я пробовала перенести память на SD карту, но внутренняя тут же заполняется. Антивирусы угроз не видят .

I tried to transfer the memory to the SD card, but the internal one fills up immediately. Antivirus threats do not see.

-GT

[Jonas]

Hi @Olya-N, welcome to our forum!

I have translated your question to English as this is an International forum.

If you go to Settings > Storage > Internal storage, can you see here which categories are the biggest ones? Cached data usually fills up pretty fast, but that only includes temporarily files that you can delete, just tap on it and tap "OK".

You can also take a look at the link below on how to free up storage space in your device.

/t5/FAQ/Free-up-storage-in-your-device-Guide-for-Android-Nougat-amp/m-p/1212614

Let me know if that helps!