Regardless of the browser, we get the spinning icon after selecting "Edit With". This is using the cloud version of confluence. Appears to make no difference using internal or external networks (in the building from the wifi or a public wifi).
I've reset Chrome to disable any add-ons, and checked the File Associations in WIndows 10 to be sure docx was pointed to Word 2016.
In the example below the target file is a docx.
The Spinning Icon never goes away unless another area has been clicked, then it disappears. The Atlassian Companion has been loaded automatically and manually, and is version 0.1.5.

Companion log: [
{"namespace":"adc:manifest-controller","date":"2019-08-06T13:37:56.294Z","message":["enabling manifest:","file"]},
{"namespace":"adc:manifest-controller","date":"2019-08-06T13:37:56.299Z","message":["disabling manifest:","screen"]},
{"namespace":"adc:manifest-controller","date":"2019-08-06T13:37:56.299Z","message":["enabling manifest:","feedback"]},
{"namespace":"adc:manifest-controller","date":"2019-08-06T13:37:56.299Z","message":["enabling manifest:","license"]},
{"namespace":"squirrel.windows","date":"2019-08-06T13:37:56.342Z","message":["processing argv as squirrel command '--was-opened-at-login'"]},
{"namespace":"adc:browser","date":"2019-08-06T13:37:56.346Z","message":["detected the app was launched at login, delaying start up by 30 seconds"]},
{"namespace":"adc:auto-updater","date":"2019-08-06T13:37:56.348Z","message":["default channel:","stable"]},
{"namespace":"adc:settings","date":"2019-08-06T13:37:56.350Z","message":["opening settings store"]},
{"namespace":"adc:analytics","date":"2019-08-06T13:37:56.494Z","message":["event","companion.start",{"new":false}]},
{"namespace":"adc:auto-updater","date":"2019-08-06T13:37:56.796Z","message":["using update URL for channel:","stable"]},
{"namespace":"adc:auto-updater","date":"2019-08-06T13:37:56.796Z","message":["constructed URL:","https://companion-release-server.us-west-1.prod.public.atl-paas.net/update/win32/0.1.5/stable"]},
{"namespace":"adc:auto-updater","date":"2019-08-06T13:37:56.806Z","message":["checking"]},
{"namespace":"adc:auto-updater","date":"2019-08-06T13:37:56.843Z","message":["autoUpdate initialized successfully"]},
{"namespace":"adc:browser","date":"2019-08-06T13:38:26.472Z","message":["launching websocket"]},
{"namespace":"adc:proxy-bypass","date":"2019-08-06T13:38:26.840Z","message":["Checking local proxy"]},
{"namespace":"adc:browser","date":"2019-08-06T13:38:26.892Z","message":["websocket launched successfully on port:",22274]},
{"namespace":"adc:auto-updater","date":"2019-08-06T13:42:57.218Z","message":["checking"]},
{"namespace":"adc:auto-updater","date":"2019-08-06T13:47:54.494Z","message":["checking"]},
{"namespace":"adc:auto-updater","date":"2019-08-06T13:52:55.088Z","message":["checking"]},
{"namespace":"adc:auto-updater","date":"2019-08-06T13:57:55.644Z","message":["checking"]},
{"namespace":"adc:auto-updater","date":"2019-08-06T14:02:56.215Z","message":["checking"]},
{"namespace":"adc:auto-updater","date":"2019-08-06T14:07:56.807Z","message":["checking"]},
{"namespace":"adc:websocket","date":"2019-08-06T14:08:34.645Z","message":["new client connection"]},
{"namespace":"adc:websocket","date":"2019-08-06T14:08:35.005Z","message":["received message:","{\"type\":\"authentication\",\"payload\":{\"provider\":\"jwt\",\"payload\":\"eyJraWQiOiJtaWNyb3MtZ3JvdXBcL2NvbmZsdWVuY2VcLzIwMTcwNzI1VDE3MDE0NyIsImFsZyI6IlJTMjU2In0.eyJhdWQiOiJhdGwtY29tcGFuaW9uIiwibmJmIjoxNTY1MTAwNTE0LCJjb25mbHVlbmNlX29yaWdpbiI6Imh0dHBzOlwvXC9sb3ppZXIuYXRsYXNzaWFuLm5ldCIsImlzcyI6Im1pY3Jvcy1ncm91cFwvY29uZmx1ZW5jZSIsImV4cCI6MTU2NTEwMDY5NCwiaWF0IjoxNTY1MTAwNTE0LCJqdGkiOiIwYTBjMjFmNC1iMGM2LTQ1YzItOTAxMi1jYTgxYzE3NDA0ZjgifQ.IxLW9Lx-1vatywPzPP_jXnJZLEYrWr_RFjt5HAOj9iQiFHSzAXH1Wq2fhW4GROtK4EzkWB7ld8J0AthOp9-ofrL_oOMKbitIAUZANG8urvi4zJIUC3hsgZ0m1qlaMAFZFxHd3MB09oQDB2fnkxUY6khSNi0VrOwvntZpIlVMSOJL5tRHb3mJQ0RnYVldCBVh_fc6zvACHj3AIr3xvBT9PCXf7lLwdtS0uLSrfW9cCBo2LPlyhjGx2SGvECqErD3aTiJLqLPipNM6bxtBX8gO7XL3U9X3aHOjE0oCmVftX87jnmPjGG_XDH4DwStGEC8Vtmf5omgE1yNQMVskRv-MjA\"},\"requestID\":1}"]},
{"namespace":"adc:auto-updater","date":"2019-08-06T14:12:57.472Z","message":["checking"]},
{"namespace":"adc:websocket","date":"2019-08-06T14:16:16.616Z","message":["new client connection"]},
{"namespace":"adc:websocket","date":"2019-08-06T14:16:17.009Z","message":["received message:","{\"type\":\"authentication\",\"payload\":{\"provider\":\"jwt\",\"payload\":\"eyJraWQiOiJtaWNyb3MtZ3JvdXBcL2NvbmZsdWVuY2VcLzIwMTcwNzI1VDE3MDE0NyIsImFsZyI6IlJTMjU2In0.eyJhdWQiOiJhdGwtY29tcGFuaW9uIiwibmJmIjoxNTY1MTAwOTc2LCJjb25mbHVlbmNlX29yaWdpbiI6Imh0dHBzOlwvXC9sb3ppZXIuYXRsYXNzaWFuLm5ldCIsImlzcyI6Im1pY3Jvcy1ncm91cFwvY29uZmx1ZW5jZSIsImV4cCI6MTU2NTEwMTE1NiwiaWF0IjoxNTY1MTAwOTc2LCJqdGkiOiJiNDY3OGIyNC01MDM1LTRmNmUtODIzYi1hNzAwZWQwZGY0YjgifQ.CWWRr1BM41lBXdrUlwFm8mXhurgBnxOoaKzIDE8VFZqmjhoWMEdaH9OEDVPm6vpNtua_jWPr8wdgcK2gZ2dYYxbyO5FdGGsXw3ODOw3FcYqQq00Crl3-u5lkimaixaxwdWPM7gxVBNE0e56gtlvoSdWHwzTeHmYm0H9wfcm8PpNqwjhJLl4FGJKf0p25Tekacapf7XdA_PqyJ1yfuOT_pLlkRnW3I11s-d0wjfSqq4liXErEddX2S6erMuuVIf0NdOYQiP4saBx5qUgtTVreSaO-iY7wdMf6VpgB3nSHfLUqw9UUQD0nkQ-Q-iFibkyDVPWlkg_KJEXD5shKz9BxMw\"},\"requestID\":1}"]},
{"namespace":"adc:auto-updater","date":"2019-08-06T14:17:58.181Z","message":["checking"]}
]