Download the blank sheet, fill it out, then upload your finished PDF to your character page.
(Feel free to make a new sheet for each level-up.)
It can work to fill the PDF directly in the browser and then save, but it sometimes fails and you can lose what you typed.
Safest workflow
Download the PDF to your computer
Open it locally (PDF reader / editor)
Fill it in
Save it
Please save your sheet as:
charactername_lvl.pdf
Example: bobby_the_builder_02.pdf
On your character page, upload the filled PDF as an attachment and link to it.
Folder location (in Wiki.js Assets):
/player/<your_character_name>/
Create the folder if it doesn’t exist yet.