Comment by wkirby

Almost certainly not; it really depends on how iCloud handles the sync. Cassava supports (at the moment) CSV (and its variants TSV, etc.) and JSON files. If your sync mechanism works well for those files in a text editor like vscode or sublime, then it will work well with Cassava. If not, there's not much we can do on our end - that's really a problem with how the sync mechanism works.