[TYPO3-english] Own extension / change uploadfolder

[Christoph Werner]

Hi all!
I´ve try to change the uploadfolder of a extension (see last lines below), but it doesnt work. Images are uploaded in fileadmin/user_uploads/ instead of the folder I want to. Does anybody have a clue?! I´ve tried deleting the tca-cachefiles, etc...
Thx!
Best
Christoph

TYPO3 8.7

TCA:

        'myimage' => [
            'exclude' => true,
            'label' => 'LLL:EXT:extmyext/Resources/Private/Language/locallang_db.xlf:tx_extcdlist_domain_model_mylist.myimage',
            'config' => \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::getFileFieldTCAConfig(
                'cdimage',
                [
                    'appearance' => [
                        'createNewRelationLinkTitle' => 'LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xlf:images.addFileReference'
                    ],
                      'foreign_types' => [
                        '0' => [
                            'showitem' => '
                            --palette--;LLL:EXT:lang/locallang_tca.xlf:sys_file_reference.imageoverlayPalette;imageoverlayPalette,
                            --palette--;;filePalette'
                        ],
                        \TYPO3\CMS\Core\Resource\File::FILETYPE_TEXT => [
                            'showitem' => '
                            --palette--;LLL:EXT:lang/locallang_tca.xlf:sys_file_reference.imageoverlayPalette;imageoverlayPalette,
                            --palette--;;filePalette'
                        ],
                        \TYPO3\CMS\Core\Resource\File::FILETYPE_IMAGE => [
                            'showitem' => '
                            --palette--;LLL:EXT:lang/locallang_tca.xlf:sys_file_reference.imageoverlayPalette;imageoverlayPalette,
                            --palette--;;filePalette'
                        ],
                        \TYPO3\CMS\Core\Resource\File::FILETYPE_AUDIO => [
                            'showitem' => '
                            --palette--;LLL:EXT:lang/locallang_tca.xlf:sys_file_reference.imageoverlayPalette;imageoverlayPalette,
                            --palette--;;filePalette'
                        ],
                        \TYPO3\CMS\Core\Resource\File::FILETYPE_VIDEO => [
                            'showitem' => '
                            --palette--;LLL:EXT:lang/locallang_tca.xlf:sys_file_reference.imageoverlayPalette;imageoverlayPalette,
                            --palette--;;filePalette'
                        ],
                        \TYPO3\CMS\Core\Resource\File::FILETYPE_APPLICATION => [
                            'showitem' => '
                            --palette--;LLL:EXT:lang/locallang_tca.xlf:sys_file_reference.imageoverlayPalette;imageoverlayPalette,
                            --palette--;;filePalette'
                        ]
                    ],
                    'maxitems' => 1,
                   'uploadfolder' => 'uploads/tx_extmyimages/',   
                ],
                $GLOBALS['TYPO3_CONF_VARS']['GFX']['imagefile_ext']
            ),
        ],