Append not valid for exportgraphics

I am unable to execute this example for appending plots to a .pdf file. Is Append no longer a valid option?

https://www.mathworks.com/help/matlab/ref/exportgraphics.html#mw_a4544e80-5ff4-4859-afa2-0d4cc627bb5e

plot([0 0.3 0.1 0.6 0.4 1]);
ax = gca;
exportgraphics(ax,outfilename)
bar(1:10)
exportgraphics(ax,outfilename,'Append',true)

Error in Untitled4 (line 11)

exportgraphics(ax,outfilename,'append',true)

Error using exportgraphics

Illegal option 'append' given.

[user86753]

The referenced example says that this functionality was introduced in 2020a but it appears to only work in R2021b.

Answer 1

[Richard Quist]

The exportgraphics function was added in R2020a, but the append option was introduced in R2021b.