src/Admin/ProductBulkLoader.php
public function imageByFilename(&$obj, $val, $record)
    {
        $filename = trim(strtolower(Convert::raw2sql($val)));
        $filenamedashes = str_replace(' ', '-', $filename);
        if ($filename
            && $image = Image::get()->whereAny(
                [
                    "LOWER(\"FileFilename\") LIKE '%$filename%'",
                    "LOWER(\"FileFilename\") LIKE '%$filenamedashes%'"
                ]
            )->first()
        ) { //ignore case
            if ($image instanceof Image && $image->exists()) {
                return $image;
            }
        }
        return null;
    }
public function imageByFilename(&$obj, $val, $record)
    {
        $filename = trim(strtolower(Convert::raw2sql($val)));
        $filenamedashes = str_replace(' ', '-', $filename);
        if ($filename
            && $image = Image::get()->whereAny(
                [
                    "LOWER(\"FileFilename\") LIKE '%$filename%'",
                    "LOWER(\"FileFilename\") LIKE '%$filenamedashes%'"
                ]
            )->first()
        ) { //ignore case
            if ($image instanceof Image && $image->exists()) {
                return $image;
            }
        }
        return null;
    }
set image, based on filename