Hi Will Smith,
Thank you for using Syncfusion products,
Before we start to providing you a solution please provide the below details,
1. Are you import excel file by using import option (ImportUrl or ribbon File -> open)? if so, how many rows and columns you are using?
2. What are all the formatting (font color, background color, formula, merge cell, wrap text etc..) you are using in your project? Since, import file is based on the JSON string’s limit and JSON string based on the rows, columns and cell formatting only.
3. If possible, provide dummy excel file which contains the same rows, columns and features used in your project.
The information provided would be great help to resolving the issue.
Regards,
Shanmugaraja K