Imported records disappear!

[Zipnyc]

Importing seems to be a simple matter yet, the 700+ imported records just keep disappearing. The target file indicates that it received the records, however, when the file is reopened after being closed the counter reads 0. Also, the source file is 29megs and after the records have disappeared, the target file is 450Kb.

If this is a corrupt file, is there a way to confirm?

TIA

[Zipnyc]

Crisis over! A forgotten closing script checking for empty records was still activated and since the imported records did not have that field ... poof, 716 records disappeared.

I knew it had to be a simple mistake because no one, anywhere!, sought help for this problem description.

Still newbie after all these years.