I am running Magento 2.2.5. I migrated from 1.When uploading a thumbnail to a category, I select the image, press save, and then the page fails to get past the whirling/loading icon, and the page remain washed out and unusable. It occurs on all browser, after logging out, clearing cache, reindex, compiled etc.I haven't touched or edited any core files.The console reports the following error...
Uncaught TypeError: value.map is not a functionat UiClass.setInitialValue (file-uploader.js:74)at UiClass.initialize (abstract.js:73)at UiClass.initialize (wrapper.js:109)at new UiClass (class.js:49)at Object.initComponent (layout.js:137)at fire (jquery.js:3232)at Object.fireWith [as resolveWith] (jquery.js:3362)at Object.deferred.(/admin_1u9idw/catalog/category/edit/key/6bfefd3ede425d7d38ed258f6746c49ffc93015a1417f514ea0773cbf7c503ea/id/165/anonymous function) (http://magento.local/static/version1524775074/adminhtml/Magento/backend/en_US/jquery.js:3461:37)at fire (jquery.js:3232)at Object.fireWith [as resolveWith] (jquery.js:3362)
I am aware of others who have had this issue and have so far not found a solution.I am desperate to fix as my category manager is current unusable.