obfs4_bridgeline.txt file should contain complete bridge line
When setting up an obfs4 bridge, the user has to perform extra steps to fill in the missing values to construct the full bridge line from /var/lib/tor/pt_state/obfs4_bridgeline.txt.
Specifically in:
Bridge obfs4 <IP ADDRESS>:<PORT> <FINGERPRINT> cert=<CERTIFICATE> iat-mode=0
only cert is populated automatically
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information