Edit a Presentation with https://cryptpad.disroot.org
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Instead of using Google Docs, I like using CryptPad, with which I can
edit documents similar to those created with LibreOffice.
I have an account with them, and I don't use my e-mail address nor a social
media account as my ID.
I can work without an account, but creating one helps in synchronizing
between devices.
What I'm creating these days is a math presentation. CryptPad allows you
to insert math equations and stuff to your slides. Click "Insert" from the
menubar, then click the "square root of x" icon to insert your equation.
In the frame created, you can add a predefined sumbols and add params to it,
or you can use TeX sequences. Then, you can right-click inside the equation
frame, choose "Equation settings" from the opend menu, and then "Current - 
Professional". You will see the equation in the WYSIWYG manner.
Notice: not all TeX sequences are supported and displayed properly, choose
someting supported in presentation files.
When you finish editing, you can export your presentation in one of the
output formats:
  * pptx
  * odp
  * bin
  * pdf

To do so, press the "File" **button**, not the option from the menubar.
Then, right of the text field, choose the output format from the drop-down
list.

For the time being, I recommend using a desktop browser.