add note on adding files to a new work on windows

quote>
quote> co-authored-by: summer <[email protected]>

README.md

@@ -66,7 +66,9 @@ This command starts the whole stack in individual containers allowing Rails to b
     - Use the steps under "Change the File Manually" at [this link](https://www.hostinger.co.uk/tutorials/how-to-edit-hosts-file#:~:text=Change%20the%20File%20Manually,-Press%20Start%20and&text=Once%20in%20Notepad%2C%20go%20to,space%2C%20then%20your%20domain%20name) to open your host file
     - At the bottom of the host file add this line: `<your-ip-address> hyku.test`
     - Save (_You may or may not need to restart your server_)
-
+2. When creating a work and adding a file, you get an internal server error due to ownership/permissions issues of the tmp directory:
+    - Gain root access to the container (in a slightly hacky way, check_volumes container runs from root): `docker compose run check_volumes bash`
+    - Change ownership to app: `chown -R app:app /app/samvera/hyrax-webapp`
 #### Tests in Docker
 
 The full spec suite can be run in docker locally. There are several ways to do this, but one way is to run the following: