Data not uploading

Hi, I am trying to add new data to my Leads table.
I cut and pasted about 115 rows of data and got the message that the data was added successfully.
However, when I checked the table I didn't see the data.
So I tried again and this time got the message that an error had occured and a zoho developer will be getting in touch with me about it.
I tried again and got the same message.
Would appreciate your prompt help with this.
All the best
David
dave