What is the best way to implement data exchange between a PC and a smartphone?

Question

Work organization

Task: exchange of ordinary - pdf, jpg, flac - files.

Follow-up question: which cloud, more precisely, a branded cloud application, has the function of synchronizing files between Windows and Android?

Answer 1

if you raise your cloud, then nextcloud
and there are a lot of cloud services

Answer 2

I use Telegram chat.
From any device , even on the console, it is available and there is no need to install heavy programs, such as a Yandex disk or, even worse, a cloud from Microsoft ...