Disappearing text in Illustartor

Please isolate that part of your file. Delete everything else but the text and the objects that belong to its group and are below it. And above all: leave the layer structure intect. And then upload the AI file to Creative Cloud or the like.

It sounds like you may be experiencing an issue with the color format you are using to change the text color. When saving a document to PDF, certain color formats may not be supported, resulting in the text appearing blank or not visible.

To resolve this issue, try changing the color format you are using to a supported format. For example, try using RGB or CMYK color mode instead of a spot color mode. You can also try using a standard color swatch from your software's color palette instead of custom color values.

Additionally, it's important to make sure that you have not accidentally set the text color to white or a very light color that may blend in with the background. Check your document's background color and make sure it contrasts with the text color.

If you're still having trouble, you may want to try exporting the document to a different file format such as a PNG or JPG image to see if the issue persists. This may help identify whether the issue is related to the PDF format or the document itself.