I am not. I am running the browser in Windows.

I tried that, and this is what I got:

-bash: xo-upload-ova: command not found

This happened while trying to import the new XO-CE ova:

2020-04-03 20:52:15,416 INFO  Audit [Main program thread] - Operation started: ImportApplianceAction: xcp-ng-tjpbvkqg: Pool aa2c727b-ecf1-a618-3e4e-30affb26cf43 (xcp-ng-tjpbvkqg): Host 0455acbf-e923-49e3-9d43-4cd28d54fdd3 (xcp-ng-tjpbvkqg): 
2020-04-03 20:52:15,430 INFO  XenOvf.Utilities.Tools [16] - Utilities.OpenArchive: Opening OVF Archive: C:\Users\<user>\Desktop\xoce-updated.ova
2020-04-03 20:52:15,430 INFO  XenOvf.OVF [16] - OVF.OpenOva: TouchFile: C:\Users\<user>\Desktop\xen__3144
2020-04-03 20:53:01,337 ERROR XenOvf.Utilities.Tools [16] - ValidateXmlToSchema Exception: Could not find a part of the path 'C:\Program Files (x86)\XCP-ng Center\Schemas\xml.xsd'.
2020-04-03 20:53:01,337 ERROR XenOvf.OVF [16] - OVF descriptor is invalid.
2020-04-03 20:53:01,337 ERROR XenOvf.OVF [16] - OVF Failed Validation, OVERRIDE return success
2020-04-03 20:53:01,353 INFO  XenOvf.OVF [16] - Import.Process: Found an Unknown Virtual Hardware Section (Rating: 5) [virtualbox-2.2]
2020-04-03 20:53:01,353 INFO  XenOvf.OVF [16] - Import.Process: Results may vary depending on hard disk image format.
2020-04-03 20:53:01,353 INFO  XenOvf.OVF [16] - Import.Process: Found an Unknown Virtual Hardware Section (Rating: 5) [virtualbox-2.2]
2020-04-03 20:53:01,353 INFO  XenOvf.OVF [16] - Import.Process: Results may vary depending on hard disk image format.
2020-04-03 20:53:01,353 INFO  XenOvf.OVF [16] - Import.Process: Found an Unknown Virtual Hardware Section (Rating: 5) [virtualbox-2.2]
2020-04-03 20:53:01,353 INFO  XenOvf.OVF [16] - Import.Process: Results may vary depending on hard disk image format.
2020-04-03 20:53:01,415 INFO  XenOvfTransport.Import [16] - Import.isURI: File: xoce-updated-disk001.vmdk is not in URI format.
2020-04-03 20:53:01,415 INFO  XenOvfTransport.Import [16] - Import.ImportFileProc: ThreadID: [16]
2020-04-03 20:53:01,430 INFO  XenOvfTransport.Import [16] - Import.isURI: File: xoce-updated-disk001.vmdk is not in URI format.
2020-04-03 20:55:12,227 ERROR XenOvfTransport.iSCSI [16] - Failed to start Transfer VM. There was a failure communicating with the plugin.
2020-04-03 20:55:12,243 ERROR XenOvfTransport.Import [16] - Failed to import a virtual disk over iSCSI. Failed to start Transfer VM.
2020-04-03 20:55:12,274 ERROR XenOvfTransport.Import [16] - Failed to import.
2020-04-03 20:55:12,274 ERROR XenOvfTransport.Import [16] - Failed to add resource Hard Disk Image. Failed to import.
2020-04-03 20:55:12,274 ERROR XenOvfTransport.Import [16] - Failed to import virtual disk from file xoce-updated-disk001.vmdk to storage repository bd55ac73-ecbb-0454-0f14-d24919b8b66c.
2020-04-03 20:55:12,290 ERROR XenOvfTransport.Import [16] - Failed to import.
2020-04-03 20:55:12,290 ERROR XenAdmin.Actions.AsyncAction [16] - System.Exception: Failed to import. ---> System.IO.InvalidDataException: Failed to add resource Hard Disk Image. ---> System.Exception: Failed to import. ---> System.Exception: Failed to import virtual disk file. ---> System.Exception: Failed to import a virtual disk over iSCSI. ---> System.Exception: Failed to start Transfer VM. ---> XenAPI.Failure: There was a failure communicating with the plugin.

I attempted to import my XO-CE ova (From virtualbox 5) into xcp-ng, but got an error saying check the log file. So I did, and noticed this:

2020-04-03 20:39:41,297 INFO  XenOvf.OVF [Main program thread] - Import.Process: Found an Unknown Virtual Hardware Section (Rating: 5) [virtualbox-2.2]
2020-04-03 20:39:41,297 INFO  XenOvf.OVF [Main program thread] - Import.Process: Results may vary depending on hard disk image format.
2020-04-03 20:39:42,250 FATAL XenAdmin.Program [Main program thread] - Uncaught exception
System.NullReferenceException: Object reference not set to an instance of an object.
   at XenAdmin.Wizards.ImportWizard.OvfStorageResource.get_RequiredDiskCapacity()
   at XenAdmin.Wizards.GenericPages.SelectVMStorageWithMultipleVirtualDisksPage.PopulateSrComboBox(List`1 commonSRs)
   at XenAdmin.Wizards.GenericPages.SelectVMStorageWithMultipleVirtualDisksPage.PopulatePage()
   at XenAdmin.Controls.XenTabPage.PageLoaded(PageLoadedDirection direction)
   at XenAdmin.Wizards.XenWizardBase.WizardProgress_EnteringStep(Object sender, WizardProgressEventArgs e)
   at XenAdmin.Wizards.WizardProgress.OnEnteringStep(Boolean isForwardsTransition)
   at XenAdmin.Wizards.WizardProgress.NextStep()
   at XenAdmin.Wizards.XenWizardBase.buttonNext_Click(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Note: The name of the file that I am trying to import is NOT called "XenOvf.ovf".

Is there a way to import an image via the CLI?

OK, I guess I thought "yarn" would be recognized from anywhere (added to the environment variable). So yarn needs to access certain files in the CWD?
Thank you!

I need to be in a certain directory to do "yarn start"?
I tried "yarn start" and get the same error.

I did "yarn run" after implementing HTTPS, and am now seeing this error.

xoa. it is probably not up to date. is there a way to import a ova from the command line interface?

I believe it's XOA. I would like to switch to the CE.
I am using HTTP.