Hi there,
Happy to help out here and thank you for the screenshots!
Looking into this, I was able to find a thread in our forum of someone else writing in about something similar here - more specifically the bold tech article.
Also, trying this on my end, I was able to achieve a similar goal by utilizing Google Sheets:
This allowed me to store the base64 string without issue.
Let me know if this works for you or if you have any additional questions!
Best,
Evan