A useful session begins with a question and ends with a decision. You do not need a long survey to discover that the restart button is hard to find. You do need to know which build was tested and what the player was trying to do.
Record the conditions
Give the build a short identifier. Record device, input method, player count and starting state. A problem seen with touch controls may not appear with a mouse. An issue after reconnecting may not appear in a fresh session. Without those details, repeating the result becomes guesswork.
Match the test mode to the question
Roblox Studio provides solo and multiplayer test modes. Its Test mode starts a player avatar; Run simulates without one. Use the mode that exercises the behaviour you need to observe. A solo check is useful for a first interaction, while a multiplayer question needs multiple clients and attention to the server view.
Separate observation from interpretation
“The player opened the menu twice and then stopped” is an observation. “The player disliked the interface” is an interpretation. Write the first before deciding on the second. Ask a neutral follow-up such as “What were you looking for?” after the task, and keep the answer separate from your notes.
Retest the change
Assign one next action and preserve the original reproduction steps. After changing the interface, run the same task again. Device and controller emulators help examine input and layouts, but they do not replace checking important behaviour on real target hardware. Keep unresolved limitations in the build record.
Further reading
These are original learning notes. Check the current official documentation when implementing platform features.