Folder rights access

I have a good question there. I have a .Net hosted outside my network this time.

what I have in my code is a small CMS to let some users uploading images in a specific folder of the website.

What's baffle me is that after deploying the site to the hosting provider, I am unable to upload images to the specified folder.

Locally, everything is ok, because I can change the rights access easily.

So here we go with the question now.

Does somebody know if I can remotely change the rights access of the folder ?

The solution I have for the moment works fine, but not 'real-time'. I just send an email to the provider to do the changes themselves, adding writing access to the folder.
It's ok, but I am still dependant from the will of somebody who can decide to slip my issue under another pile of requests !

Thankfully I host most of my projects. I don't understand why this can't be solved at the .Net age.

After all when I have to deploy my site, I have to identify myself as a kind of full control user in the provider server.

So why it is not possible through Visual Studio to let me change myself my 'own' folders rights ?