How to specify "external directory" as file storage?

Question

Flask

Hello everyone
Plz tell me How to specify the "external directory" as the file storage?
Clarification\example:
there is img:

<img src="/static/filestorage/dart.jpg" alt="Письма мастера дзен">

flask returns the 200th status, everything is OK, but the file is located in the directory (from the fs root):
/home/user/project_name/app/static/filestorage/dart.jpg

and I, for example, need to specify the directory for storage:
/var /filestorage/dart.jpg (starting from fs root)

plz tell me how to do it. but rather poke into the documentation, tk. I have not found such information yet
ps It is
worth adding that the file name in src will be set by a macro, so using the "frontend" server (Jinx Apache, etc.) does not make sense, because the application logic does not allow
Thank you

Answer 1

1. ln -s /var/filestorage /home/user/project_name/app/static/filestorage
2. specify the required location in nginx (or other web server):

location /filestorage {
root /var;
}

Answer 2

Maybe this can help you:

flask.pocoo.org/docs/0.11/api/#flask.send_from_dir...