phpMyAdmin Import Failure - Invalid or uninitialized Zip object (no replies)

Some background info:
Wampserver v. 3.2.3
PHP v. 7.3.21 (have tried nearly all 7.x versions, thinking that might be the issue)
All wampserver services are running
tmp folder has all read/write permissions (windows)


I'm trying to import an excel file through phpMyAdmin as the start of a database. I saved the excel file as an OpenDocument Spreadsheed (.ods) and used Notepad++ to convert this .ods file to the UTF-8 character set. On attempted import, I get the following 'warnings' reported, which are really fatal errors.


Warning in .\libraries\classes\ZipExtension.php#102
ZipArchive::getStatusString(): Invalid or uninitialized Zip object

Backtrace

.\libraries\classes\ZipExtension.php#102: ZipArchive->getStatusString()
.\libraries\classes\File.php#686: PhpMyAdmin\ZipExtension->getContents(
string 'C:\\wamp64\\tmp\\php55D5.tmp',
NULL,
)
.\libraries\classes\File.php#661: PhpMyAdmin\File->openZip()
.\import.php#502: PhpMyAdmin\File->open()
Warning in .\libraries\classes\ZipExtension.php#103
ZipArchive::close(): Invalid or uninitialized Zip object

Backtrace

.\libraries\classes\ZipExtension.php#103: ZipArchive->close()
.\libraries\classes\File.php#686: PhpMyAdmin\ZipExtension->getContents(
string 'C:\\wamp64\\tmp\\php55D5.tmp',
NULL,
)
.\libraries\classes\File.php#661: PhpMyAdmin\File->openZip()
.\import.php#502: PhpMyAdmin\File->open()



The 'Invalid or uninitialized Zip object' seems to be caused by a number of things from my searching; sometimes php syntax issues, but I can't solve for that because phpMyAdmin is writing the php in this instance.

Attempting to save this file as Windows-1252 character set, and then importing with that char set gives a different group of errors on attempted import:

Fatal error: Uncaught TypeError: Return value of PhpMyAdmin\Encoding::convertString() must be of the type string, bool returned in C:\wamp64\apps\phpmyadmin5.0.2\libraries\classes\Encoding.php on line 200

TypeError: Return value of PhpMyAdmin\Encoding::convertString() must be of the type string, bool returned in C:\wamp64\apps\phpmyadmin5.0.2\libraries\classes\Encoding.php on line 200

Thanks in advance for your help!