Portainer does not allow upper case letters in the stack name. Update documentation to adhere to this limitation.
# To install and update paperless with this file, do the following:
#
# - Open portainer Stacks list and click 'Add stack'
-# - Paste the contents of this file and assign a name, e.g. 'Paperless'
+# - Paste the contents of this file and assign a name, e.g. 'paperless'
# - Click 'Deploy the stack' and wait for it to be deployed
# - Open the list of containers, select paperless_webserver_1
# - Click 'Console' and then 'Connect' to open the command line inside the container