This particular server has the peculiarity that only the "raw" pages can be edited. That is:

you read the page in a Gemini client and decide to edit it

you download the raw Gemtext in order to edit it

you upload the new Gemtext to the raw URL

Example:

To read the “testing” page in Gemini format:

To read the “testing” page in raw format:

To write to the raw page, use the following URL, followed by a payload of ten bytes, e.g. “hello wiki”:

Why is this? The raw page text contains neither title nor footer. It is added by the wiki. Thus, if you edit the regular page, you'll have to remember to remove title and footer before saving. Otherwise you'll end up doubling it all.

Furthermore, some clients will transform the gemtext and remove the markup before displaying the text. If you use that text as the source of editing a page, all the markup is gone and needs to be added back, manually.

That's why it's a good idea to always use the raw text for editing an existing page on the wiki.