Just tried it and:
$ ./PhotoTeleport_0.6-4.AppImage
qt.network.ssl: QSslSocket: cannot resolve SSL_set_alpn_protos
qt.network.ssl: QSslSocket: cannot resolve SSL_CTX_set_alpn_select_cb
qt.network.ssl: QSslSocket: cannot resolve SSL_get0_alpn_selected
qt.svg: link SVGID_63_ hasn't been detected!
qt.svg: link SVGID_63_ hasn't been detected!
qt.svg: link SVGID_63_ hasn't been detected!
qt.svg: link SVGID_63_ hasn't been detected!
/home/mardy/src/accounts-sso/libauthentication/plugins/signon-oauth2/src/plugin.cpp 44 Plugin :
/home/mardy/src/accounts-sso/libauthentication/plugins/signon-oauth2/src/oauth2plugin.cpp 84 OAuth2PluginPrivate :
/home/mardy/src/accounts-sso/libauthentication/plugins/signon-oauth2/src/oauth2plugin.cpp 111 OAuth2Plugin :
/home/mardy/src/accounts-sso/libauthentication/plugins/signon-oauth2/src/oauth2plugin.cpp 164 sendOAuth2AuthRequest : Url = "https://accounts.google.com/o/oauth2/v2/auth?access_type=offline&client_id=261797508896-0asp3so71qd1th0mopsgc9eknb2atbo8.apps.googleusercontent.com&redirect_uri=https%3A%2F%2Fwww.mardy.it%2Foauth%2Fteleport&state=1502547649&response_type=code&scope=https%3A%2F%2Fpicasaweb.google.com%2Fdata%2F profile"
Could not find QtWebEngineProcess
[15630:15630:0705/202706.044349:FATAL:zygote_host_impl_linux.cc(182)] Check failed: ReceiveFixedMessage(fds[0], kZygoteBootMessage, sizeof(kZygoteBootMessage), &boot_pid).
#0 0x7f382ff167be <unknown>
#1 0x7f382ff284ce <unknown>
#2 0x7f382fb88263 <unknown>
#3 0x7f382fb86f5b <unknown>
#4 0x7f382fb874fe <unknown>
#5 0x7f382f84339d <unknown>
#6 0x7f382f846c43 <unknown>
#7 0x7f382f641adf <unknown>
#8 0x7f382f642db5 <unknown>
#9 0x7f382f5dc5b1 QtWebEngineCore::BrowserContextAdapter::defaultContext()
#10 0x7f38358da4c8 QQuickWebEngineProfile::defaultProfile()
#11 0x7f38358e04aa QQuickWebEngineViewPrivate::QQuickWebEngineViewPrivate()
#12 0x7f38358e125b QQuickWebEngineView::QQuickWebEngineView()
#13 0x7f37efbe5470 <unknown>
#14 0x7f383b059243 QQmlType::create()
#15 0x7f383b0c5e84 QQmlObjectCreator::createInstance()
#16 0x7f383b0c6661 QQmlObjectCreator::create()
#17 0x7f383b045b67 QQmlComponentPrivate::beginCreate()
#18 0x7f383b0435e9 QQmlComponent::create()
#19 0x7f383a1273d4 <unknown>
#20 0x7f383a127bd5 <unknown>
#21 0x7f383a125ed1 QQuickViewController::onWindowChanged()
#22 0x7f383a5d4246 QMetaObject::activate()
#23 0x7f383c5aa042 QQuickItem::windowChanged()
#24 0x7f383c5bb800 QQuickItemPrivate::refWindow()
#25 0x7f383c5bbfed QQuickItem::setParentItem()
#26 0x7f383c6526e5 <unknown>
#27 0x7f383b048650 <unknown>
#28 0x7f383b048a35 QQmlEnginePrivate::incubate()
#29 0x7f383b043f16 QQmlComponent::create()
#30 0x7f383c6517ea <unknown>
#31 0x7f383c651968 <unknown>
#32 0x7f383c651c0f <unknown>
#33 0x7f383c6521f4 <unknown>
#34 0x7f383c652620 <unknown>
#35 0x7f383b0841d9 <unknown>
#36 0x7f383b00a0a4 QV4::QObjectMethod::callInternal()
#37 0x7f383b0217bb QV4::Runtime::method_callProperty()
#38 0x7f380807caee <unknown>
I added some photos, clicked next, selected Google photos, next, crash.