Thank you for reaching out to the Community! I'm happy to provide some assistance with importing products to the Shopify admin, to ensure this gets resolved.
While CSV files allow you to upload products in bulk to the Shopify admin, they do hold some file size limitations. Currently, CSV imports are limited to a maximum of 15MB for products, and 1MB for customers. For more information on this, I recommend checking out our Managing Files documents as it touches on this in further details.
As I can completely understand the impact of this, I recommend checking out the Shopify App Store for an app that may allow for larger file size imports. For ease, I've gone ahead and suggested a few apps below that you can look into:
I'd recommend getting in touch with the app developers directly however, to confirm the apps capabilities. They will be able to provide clarification on whether or not the app will fit your shop's needs. To get in contact with an app developer, you can head to the Shopify App Store and select Support > Send A Message.
Please let me know if you have any other questions or concerns.
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